Add logging level for RNPM previous linking
Add logging level for RNPM previous linking

Summary:
Sometimes when working with a team of developers, someone adds a library but does not link it.  To identify if this required linking, you have to type `react-native link` and then read a wall of text to see if rnpm handled the issue.   This can be sped up with a friendly logging level for previously linked messages.

**This PR turns this:**
![screen shot 2016-08-21 at 11 49 07 am](https://cloud.githubusercontent.com/assets/997157/17838588/84223264-6796-11e6-81d2-075d30942a69.png)

**Into this:**
![screen shot 2016-08-21 at 11 52 31 am](https://cloud.githubusercontent.com/assets/997157/17838592/92c2ce64-6796-11e6-884d-e5af8f4c2b5a.png)

Which is a pretty nice experience!   This also helps you quickly identify when 1 thing wasn't linked, at a glance, like so!
![image](https://cloud.githubusercontent.com/assets/997157/17838613/22568c8c-6797-11e6-8e12-c73746ec0eff.png)
Closes https://github.com/facebook/react-native/pull/9507

Differential Revision: D3757516

fbshipit-source-id: e4c691824e9318d36f4c1d89673b7e747fb972f1

Bhullnatik/react-native,tgoldenberg/react-native,Ehesp/react-native,skevy/react-native,javache/react-native,gitim/react-native,shrutic/react-native,peterp/react-native,Ehesp/react-native,salanki/react-native,hoastoolshop/react-native,peterp/react-native,xiayz/react-native,tsjing/react-native,Andreyco/react-native,chnfeeeeeef/react-native,alin23/react-native,christopherdro/react-native,javache/react-native,javache/react-native,cosmith/react-native,Andreyco/react-native,naoufal/react-native,hoastoolshop/react-native,hoastoolshop/react-native,DannyvanderJagt/react-native,myntra/react-native,dikaiosune/react-native,cosmith/react-native,DannyvanderJagt/react-native,ndejesus1227/react-native,imjerrybao/react-native,jadbox/react-native,forcedotcom/react-native,formatlos/react-native,satya164/react-native,cdlewis/react-native,charlesvinette/react-native,aljs/react-native,tszajna0/react-native,aaron-goshine/react-native,clozr/react-native,shrutic/react-native,skevy/react-native,orenklein/react-native,nickhudkins/react-native,peterp/react-native,clozr/react-native,janicduplessis/react-native,eduardinni/react-native,orenklein/react-native,callstack-io/react-native,brentvatne/react-native,lprhodes/react-native,foghina/react-native,brentvatne/react-native,aljs/react-native,Andreyco/react-native,forcedotcom/react-native,orenklein/react-native,exponent/react-native,shrutic123/react-native,jasonnoahchoi/react-native,CodeLinkIO/react-native,tadeuzagallo/react-native,chnfeeeeeef/react-native,happypancake/react-native,shrutic123/react-native,callstack-io/react-native,javache/react-native,salanki/react-native,doochik/react-native,skevy/react-native,charlesvinette/react-native,browniefed/react-native,brentvatne/react-native,cpunion/react-native,myntra/react-native,lprhodes/react-native,esauter5/react-native,csatf/react-native,jadbox/react-native,janicduplessis/react-native,jevakallio/react-native,Swaagie/react-native,DannyvanderJagt/react-native,peterp/react-native,ptmt/react-native-macos,christopherdro/react-native,gilesvangruisen/react-native,doochik/react-native,Ehesp/react-native,PlexChat/react-native,doochik/react-native,gilesvangruisen/react-native,dikaiosune/react-native,Livyli/react-native,PlexChat/react-native,tadeuzagallo/react-native,cdlewis/react-native,nickhudkins/react-native,farazs/react-native,gitim/react-native,tarkus/react-native-appletv,hoastoolshop/react-native,alin23/react-native,exponentjs/react-native,Swaagie/react-native,hammerandchisel/react-native,Maxwell2022/react-native,salanki/react-native,dikaiosune/react-native,jaggs6/react-native,tgoldenberg/react-native,formatlos/react-native,gitim/react-native,Livyli/react-native,thotegowda/react-native,tarkus/react-native-appletv,browniefed/react-native,csatf/react-native,imDangerous/react-native,charlesvinette/react-native,PlexChat/react-native,Livyli/react-native,gitim/react-native,janicduplessis/react-native,DanielMSchmidt/react-native,foghina/react-native,shrutic/react-native,negativetwelve/react-native,brentvatne/react-native,eduardinni/react-native,skevy/react-native,chnfeeeeeef/react-native,naoufal/react-native,satya164/react-native,callstack-io/react-native,alin23/react-native,Guardiannw/react-native,callstack-io/react-native,jaggs6/react-native,satya164/react-native,cpunion/react-native,aaron-goshine/react-native,myntra/react-native,csatf/react-native,brentvatne/react-native,farazs/react-native,makadaw/react-native,charlesvinette/react-native,happypancake/react-native,aaron-goshine/react-native,catalinmiron/react-native,formatlos/react-native,aaron-goshine/react-native,christopherdro/react-native,Andreyco/react-native,mironiasty/react-native,peterp/react-native,negativetwelve/react-native,negativetwelve/react-native,esauter5/react-native,ptmt/react-native-macos,Swaagie/react-native,ptmt/react-native-macos,Purii/react-native,clozr/react-native,cosmith/react-native,clozr/react-native,Bhullnatik/react-native,skevy/react-native,hammerandchisel/react-native,rickbeerendonk/react-native,hoangpham95/react-native,imjerrybao/react-native,foghina/react-native,formatlos/react-native,esauter5/react-native,adamjmcgrath/react-native,tszajna0/react-native,tszajna0/react-native,eduardinni/react-native,pandiaraj44/react-native,charlesvinette/react-native,makadaw/react-native,salanki/react-native,imjerrybao/react-native,adamjmcgrath/react-native,exponent/react-native,ptmt/react-native-macos,imjerrybao/react-native,cpunion/react-native,cosmith/react-native,rickbeerendonk/react-native,happypancake/react-native,ptomasroos/react-native,salanki/react-native,lprhodes/react-native,imDangerous/react-native,DannyvanderJagt/react-native,imDangerous/react-native,chnfeeeeeef/react-native,alin23/react-native,callstack-io/react-native,nickhudkins/react-native,htc2u/react-native,ptmt/react-native-macos,javache/react-native,tsjing/react-native,charlesvinette/react-native,Guardiannw/react-native,cdlewis/react-native,christopherdro/react-native,arthuralee/react-native,CodeLinkIO/react-native,jaggs6/react-native,skevy/react-native,ptmt/react-native-macos,foghina/react-native,Guardiannw/react-native,myntra/react-native,gre/react-native,Andreyco/react-native,shrutic/react-native,cpunion/react-native,clozr/react-native,janicduplessis/react-native,makadaw/react-native,eduardinni/react-native,brentvatne/react-native,aaron-goshine/react-native,exponentjs/react-native,happypancake/react-native,hoastoolshop/react-native,formatlos/react-native,ptomasroos/react-native,farazs/react-native,ptomasroos/react-native,cdlewis/react-native,xiayz/react-native,orenklein/react-native,myntra/react-native,tszajna0/react-native,adamjmcgrath/react-native,rickbeerendonk/react-native,shrutic/react-native,PlexChat/react-native,janicduplessis/react-native,orenklein/react-native,gitim/react-native,gitim/react-native,rickbeerendonk/react-native,rickbeerendonk/react-native,callstack-io/react-native,formatlos/react-native,jadbox/react-native,happypancake/react-native,christopherdro/react-native,xiayz/react-native,dikaiosune/react-native,farazs/react-native,jevakallio/react-native,thotegowda/react-native,aaron-goshine/react-native,tgoldenberg/react-native,gitim/react-native,DannyvanderJagt/react-native,mironiasty/react-native,lprhodes/react-native,satya164/react-native,facebook/react-native,htc2u/react-native,farazs/react-native,eduardinni/react-native,arthuralee/react-native,tarkus/react-native-appletv,tadeuzagallo/react-native,eduardinni/react-native,tadeuzagallo/react-native,cpunion/react-native,happypancake/react-native,Ehesp/react-native,DanielMSchmidt/react-native,satya164/react-native,doochik/react-native,hoangpham95/react-native,formatlos/react-native,DanielMSchmidt/react-native,Swaagie/react-native,Bhullnatik/react-native,naoufal/react-native,javache/react-native,jasonnoahchoi/react-native,makadaw/react-native,makadaw/react-native,tadeuzagallo/react-native,orenklein/react-native,jasonnoahchoi/react-native,negativetwelve/react-native,foghina/react-native,DanielMSchmidt/react-native,aljs/react-native,thotegowda/react-native,DanielMSchmidt/react-native,ankitsinghania94/react-native,christopherdro/react-native,xiayz/react-native,mironiasty/react-native,catalinmiron/react-native,facebook/react-native,Guardiannw/react-native,Andreyco/react-native,myntra/react-native,forcedotcom/react-native,cosmith/react-native,aljs/react-native,lprhodes/react-native,gre/react-native,ptomasroos/react-native,tgoldenberg/react-native,rickbeerendonk/react-native,Livyli/react-native,makadaw/react-native,exponent/react-native,PlexChat/react-native,htc2u/react-native,brentvatne/react-native,jasonnoahchoi/react-native,gre/react-native,shrutic123/react-native,htc2u/react-native,exponent/react-native,hoastoolshop/react-native,brentvatne/react-native,mironiasty/react-native,brentvatne/react-native,jaggs6/react-native,tarkus/react-native-appletv,adamjmcgrath/react-native,ptomasroos/react-native,pandiaraj44/react-native,Ehesp/react-native,ankitsinghania94/react-native,thotegowda/react-native,peterp/react-native,mironiasty/react-native,Livyli/react-native,catalinmiron/react-native,jevakallio/react-native,happypancake/react-native,imDangerous/react-native,exponent/react-native,browniefed/react-native,gitim/react-native,thotegowda/react-native,alin23/react-native,catalinmiron/react-native,farazs/react-native,Purii/react-native,ptmt/react-native-macos,DannyvanderJagt/react-native,gre/react-native,htc2u/react-native,CodeLinkIO/react-native,ankitsinghania94/react-native,aaron-goshine/react-native,catalinmiron/react-native,gilesvangruisen/react-native,htc2u/react-native,ndejesus1227/react-native,formatlos/react-native,ndejesus1227/react-native,adamjmcgrath/react-native,naoufal/react-native,doochik/react-native,forcedotcom/react-native,ptomasroos/react-native,Bhullnatik/react-native,javache/react-native,tadeuzagallo/react-native,tgoldenberg/react-native,frantic/react-native,gre/react-native,facebook/react-native,nickhudkins/react-native,tszajna0/react-native,ankitsinghania94/react-native,DanielMSchmidt/react-native,tadeuzagallo/react-native,alin23/react-native,esauter5/react-native,myntra/react-native,frantic/react-native,jadbox/react-native,rickbeerendonk/react-native,Swaagie/react-native,christopherdro/react-native,exponentjs/react-native,gilesvangruisen/react-native,Maxwell2022/react-native,cdlewis/react-native,hoangpham95/react-native,Ehesp/react-native,chnfeeeeeef/react-native,peterp/react-native,imDangerous/react-native,jasonnoahchoi/react-native,tadeuzagallo/react-native,Guardiannw/react-native,PlexChat/react-native,xiayz/react-native,jadbox/react-native,Swaagie/react-native,exponent/react-native,jasonnoahchoi/react-native,tarkus/react-native-appletv,jasonnoahchoi/react-native,imDangerous/react-native,Maxwell2022/react-native,alin23/react-native,Guardiannw/react-native,adamjmcgrath/react-native,alin23/react-native,browniefed/react-native,naoufal/react-native,ankitsinghania94/react-native,naoufal/react-native,eduardinni/react-native,tszajna0/react-native,naoufal/react-native,DanielMSchmidt/react-native,pandiaraj44/react-native,Purii/react-native,tsjing/react-native,CodeLinkIO/react-native,callstack-io/react-native,tszajna0/react-native,hoangpham95/react-native,browniefed/react-native,exponentjs/react-native,imjerrybao/react-native,esauter5/react-native,jaggs6/react-native,exponentjs/react-native,jaggs6/react-native,Purii/react-native,cpunion/react-native,janicduplessis/react-native,jevakallio/react-native,exponent/react-native,clozr/react-native,skevy/react-native,mironiasty/react-native,mironiasty/react-native,ankitsinghania94/react-native,esauter5/react-native,csatf/react-native,facebook/react-native,aljs/react-native,DannyvanderJagt/react-native,aljs/react-native,kesha-antonov/react-native,ndejesus1227/react-native,gilesvangruisen/react-native,Purii/react-native,cosmith/react-native,clozr/react-native,jevakallio/react-native,Bhullnatik/react-native,kesha-antonov/react-native,imjerrybao/react-native,cpunion/react-native,nickhudkins/react-native,Livyli/react-native,Purii/react-native,browniefed/react-native,htc2u/react-native,arthuralee/react-native,forcedotcom/react-native,Bhullnatik/react-native,kesha-antonov/react-native,nickhudkins/react-native,Andreyco/react-native,shrutic/react-native,formatlos/react-native,thotegowda/react-native,doochik/react-native,Bhullnatik/react-native,PlexChat/react-native,gilesvangruisen/react-native,jadbox/react-native,shrutic123/react-native,gre/react-native,orenklein/react-native,lprhodes/react-native,Bhullnatik/react-native,xiayz/react-native,happypancake/react-native,CodeLinkIO/react-native,tgoldenberg/react-native,htc2u/react-native,javache/react-native,christopherdro/react-native,dikaiosune/react-native,kesha-antonov/react-native,tarkus/react-native-appletv,nickhudkins/react-native,cdlewis/react-native,rickbeerendonk/react-native,hoangpham95/react-native,rickbeerendonk/react-native,chnfeeeeeef/react-native,pandiaraj44/react-native,frantic/react-native,jevakallio/react-native,charlesvinette/react-native,cdlewis/react-native,foghina/react-native,negativetwelve/react-native,cdlewis/react-native,Guardiannw/react-native,Maxwell2022/react-native,shrutic123/react-native,Maxwell2022/react-native,ndejesus1227/react-native,imjerrybao/react-native,negativetwelve/react-native,imDangerous/react-native,tsjing/react-native,facebook/react-native,shrutic/react-native,chnfeeeeeef/react-native,chnfeeeeeef/react-native,tarkus/react-native-appletv,DannyvanderJagt/react-native,frantic/react-native,Ehesp/react-native,tszajna0/react-native,Livyli/react-native,tgoldenberg/react-native,hoangpham95/react-native,jadbox/react-native,exponentjs/react-native,hammerandchisel/react-native,thotegowda/react-native,mironiasty/react-native,arthuralee/react-native,Guardiannw/react-native,hammerandchisel/react-native,catalinmiron/react-native,forcedotcom/react-native,xiayz/react-native,Maxwell2022/react-native,farazs/react-native,lprhodes/react-native,facebook/react-native,skevy/react-native,farazs/react-native,exponentjs/react-native,pandiaraj44/react-native,negativetwelve/react-native,negativetwelve/react-native,eduardinni/react-native,Swaagie/react-native,cosmith/react-native,kesha-antonov/react-native,jevakallio/react-native,makadaw/react-native,thotegowda/react-native,hammerandchisel/react-native,ndejesus1227/react-native,browniefed/react-native,CodeLinkIO/react-native,foghina/react-native,Livyli/react-native,shrutic123/react-native,aaron-goshine/react-native,dikaiosune/react-native,ndejesus1227/react-native,tgoldenberg/react-native,Swaagie/react-native,kesha-antonov/react-native,facebook/react-native,dikaiosune/react-native,adamjmcgrath/react-native,esauter5/react-native,DanielMSchmidt/react-native,shrutic/react-native,hoastoolshop/react-native,mironiasty/react-native,doochik/react-native,Purii/react-native,lprhodes/react-native,tarkus/react-native-appletv,peterp/react-native,esauter5/react-native,ankitsinghania94/react-native,myntra/react-native,makadaw/react-native,hammerandchisel/react-native,orenklein/react-native,Ehesp/react-native,catalinmiron/react-native,jaggs6/react-native,forcedotcom/react-native,exponentjs/react-native,salanki/react-native,ndejesus1227/react-native,forcedotcom/react-native,facebook/react-native,jaggs6/react-native,pandiaraj44/react-native,tsjing/react-native,hammerandchisel/react-native,kesha-antonov/react-native,cdlewis/react-native,Maxwell2022/react-native,PlexChat/react-native,tsjing/react-native,frantic/react-native,satya164/react-native,csatf/react-native,ptomasroos/react-native,shrutic123/react-native,doochik/react-native,satya164/react-native,cpunion/react-native,aljs/react-native,pandiaraj44/react-native,callstack-io/react-native,kesha-antonov/react-native,xiayz/react-native,csatf/react-native,CodeLinkIO/react-native,imDangerous/react-native,nickhudkins/react-native,gilesvangruisen/react-native,jadbox/react-native,jasonnoahchoi/react-native,catalinmiron/react-native,farazs/react-native,csatf/react-native,CodeLinkIO/react-native,gilesvangruisen/react-native,exponent/react-native,pandiaraj44/react-native,Andreyco/react-native,tsjing/react-native,jevakallio/react-native,naoufal/react-native,ptmt/react-native-macos,jevakallio/react-native,dikaiosune/react-native,foghina/react-native,facebook/react-native,hoastoolshop/react-native,adamjmcgrath/react-native,gre/react-native,aljs/react-native,gre/react-native,janicduplessis/react-native,kesha-antonov/react-native,janicduplessis/react-native,ptomasroos/react-native,satya164/react-native,charlesvinette/react-native,hammerandchisel/react-native,negativetwelve/react-native,doochik/react-native,Maxwell2022/react-native,salanki/react-native,ankitsinghania94/react-native,myntra/react-native,hoangpham95/react-native,shrutic123/react-native,csatf/react-native,browniefed/react-native,tsjing/react-native,imjerrybao/react-native,arthuralee/react-native,hoangpham95/react-native,salanki/react-native,javache/react-native,Purii/react-native,makadaw/react-native,clozr/react-native,cosmith/react-native