Document Uglify warnings
Document Uglify warnings

The `gulp build --release` creates a few hundred warnings from Uglify; add some documentation to keep surprises low.

The warnings are generally dead code removal, e.g.,:

   WARNING in (undefined) app.js from UglifyJs 
   Condition always false [./~/react/lib/invariant.js:26,0]
  Dropping unreachable code [./~/react/lib/invariant.js:27,0]
  ...
  Dropping unused function defineWarningProperty [./~/react/lib/ReactElement.js:32,0]
  ...
SFDevLabs/react-starter-kit,globalART19/OrderedOptions,pvijeh/sull-isom2,piscis/react-starter-kit,jessamynsmith/MintWebApp,trus-sangwarn/react-starter,maysale01/react-platform,maysale01/react-platform,pvijeh/sull-isom2,patrickkillalea/React1,buildbreakdo/react-starter-kit,miketamis/CaughtHere,brian-kilpatrick/react-starter-kit,jsivakumaran/map-app,luznlun/kkRoom,roskom/MyApp,bsy/react-starter-kit,jesperh/tuho2.0-react,emil-alexandrescu/react-starter-kit,danielxiaowxx/react-starter-kit,ynu/res-track-wxe,clickbuster/smite-calculator,amyalichkin/react-starter-kit,bpeters/nafcweb,kinshuk-jain/TB-Dfront,artemkaint/react-starter-kit,aalluri-navaratan/react-starter-kit,ZoeyYoung/react-starter-kit,w01fgang/react-starter-kit,sloppylopez/react-starter-kit,0xcdc/rfb-client-app,ronlobo/react-starter-kit,saadanerdetbare/react-starter-kit,chytanya/microcredentials-client,takahashik/todo-app,bigwaterconsulting/to_dash_live,pppp22591558/ChinaPromotion,cabouffard/MusicServer-Frontend,arolla/Arollydays,juliocanares/react-starter-kit,soma06-2/soma06-2-web-client,Gabs00/react-starter-kit,bsy/react-starter-kit,hang-up/react-whatever,kaushik94/react-starter,BlakeRxxk/react-starter-kit,seriflafont/react-starter-kit,stinkyfingers/IsoTest,loganfreeman/react-is-fun,vlad06/react-starter-kit,Creatrixino/react-starter-kit,ADourgarian/Syscoin-Payroll,HoomanGriz/react-starter-kit,Mobiletainment/react-starter-kit,pvijeh/peter-vijeh-personal-site,concerned3rdparty/react-starter-kit,alexmasselot/medlineGeoWebFrontend,Demesheo/react-starter-kit,tomesposito/blog,sonbui00/react-starter-kit,devinschulz/react-starter-kit,srslafazan/react-profile-starter,thesyllable/wom2,KantanGroup/zuzu-sites,waelio/react-starter-kit,solome/react-starter-kit,vanessadyce/react-proto,jackygrahamez/react-starter-kit,kuao775/mandragora,garposmack/react-starter-kit,iamfrontender/resume,ben-miller/adddr.io,louisukiri/react-starter-kit,barretts/react-starter-kit,garposmack/react-starter-kit,patrickkillalea/react-starter-kit,alexmasselot/react-starter-kit,dongtong/react-starter-kit,arolla/Arollydays,teosz/test-problem-reproduce,mlem8/dev-challenge,fsad/react-starter-kit,DVLP/react-starter-kit,0xcdc/rfb-client-app,seanlin816/react-starter-kit,shaunstanislaus/react-starter-kit,neozhangthe1/react-starter-kit,ajhsu/react-starter-kit,BrianGenisio/gobus,srslafazan/react-profile-starter,chen844033231/react-starter-kit,tcrosen/nhl-scores,larsvinter/react-starter-kit,eafelix/react-starter-kit,w01fgang/react-starter-kit,cuitianze/demo,nicolascine/site,akfreas/ReactTest,barretts/react-starter-kit,cuitianze/demo,Skoli-Code/DerangeonsLaChambre,AlexKhymenko/ES6React,cmosguy/react-redux-auth0,khankuan/asset-library-demo,sallen450/react-starter-kit,jtiscione/redux-chess,juliocanares/react-starter-kit,fkn/ndo,artemkaint/react-starter-kit,Nexapp/react-starter-kit,MxMcG/tourlookup-react,DanielHabib/react-starter-kit,johnrenko/React,jesperh/tuho2.0-react,domenicosolazzo/react-starter-kit,nicolasmoise/CMC-2,schnerd/react-starter-kit,pvijeh/isomorphic-react-local-discovery,chen844033231/react-starter-kit,Fedulab/FeduLab,benbs/Office-Player,f15gdsy/react-starter-kit,Hawt-Lava/Flare,ryanherlihy/react-starter-kit,labreaks/ep-web-app,aaron-goshine/react-starter-kit,devonzuegel/cosmocat,wseo88/react-starter-kit,TCotton/penny-books,Hawt-Lava/Flare,yinaw/travelBook,djfm/ps-translations-interface-mockup,bopeng87/reactfullstack,dongtong/react-starter-kit,pandoraui/react-starter,frob/react-starter-kit-lite,tstangenberg/apitest-editor,mortenryum/loanCalculator,edgarallanglez/foxacademia_frontend,sonbui00/react-starter-kit,seriflafont/react-starter-kit,janusnic/react-starter-kit,rameshrr/dicomviewer,shaialon/react-starter-kit,pppp22591558/pa_course_lobby,dervos/react-starter-kit,ZoeyYoung/react-starter-kit,eafelix/react-starter-kit,hang-up/react-whatever,benbs/Office-Player,pppp22591558/pa_course_lobby,carlosCeron/react-starter-kit,swhite24/react-starter-kit,como-quesito/react-starter-kit,andmilj/vip-transfers,zsu13579/pinterest-apollo,LukevdPalen/react-starter-kit,BrettHoyer/fatwithfriends,quasicrial/quasicrial,patrickkillalea/React1,sjackson212/A6DotCom,avaneeshd/spotnote-web,vbdoug/ISOReStack,jwhchambers/react-starter-kit,quyetvv/react-starter-kit,trus-sangwarn/react-starter,mDinner/musicansAssistant,nithinpeter/nightpecker,AlexKhymenko/ES6React,johnrenko/React,albperezbermejo/react-starter-kit,Frenzzy/react-starter-kit,soma06-2/soma06-2-web-client,p-a/react-starter-kit,devinschulz/react-starter-kit,zsu13579/whatsgoinontonight,rdanieldesign/MemoryApp-ReactStarter,vbdoug/ISOReStack,binyuace/vote,ubien/react-starter-kit,kevinchau321/TReactr,jshultz/secret_project,alexmasselot/medlineGeoWebFrontend,loganfreeman/react-is-fun,teosz/test-problem-reproduce,jhabdas/lumpenradio-com,avaneeshd/spotnote-web,sherlock221/react-starter-kit,dervos/react-starter-kit,monotonique/react-starter-kit,siddhant3s/crunchgraph,pvijeh/peter-vijeh-personal-site,DanielHabib/react-starter-kit,djfm/ps-translations-interface-mockup,HoomanGriz/react-starter-kit,larsvinter/react-starter-kit,DanielHabib/onboarding,nithinpeter/nightpecker,maximhoffman/beginnertuts,mzgnr/react-starter-kit,patrickkillalea/react-starter-kit,arolla/Arollydays,danielxiaowxx/react-starter-kit,nobesnickr/react-starter-kit,monotonique/react-starter-kit,fsad/react-starter-kit,amyalichkin/react-starter-kit,iteacat/cc_deals,cabouffard/MusicServer-Frontend,labreaks/ep-web-app,SlexAxton/oddjobsf,ACPK/react-starter-kit,aos2006/tesDeploy,egut/react-docker-demo,bpeters/nafcweb,gokberkisik/react-starter-kit,pawsong/react-starter-kit,DanielHabib/HowManyBalloons,AntonyKwok/react-starter-kit,kutou/react-starter-kit,zbrukas/wwf-store,vlad06/react-starter-kit,thesyllable/wom2,rdanieldesign/MemoryApp-ReactStarter,victoryancn/react-starter-kit,zhiyelee/react-starter-kit,sloppylopez/react-starter-kit,frob/react-starter-kit-lite,royriojas/react-starter-kit,Nikhil22/trooper,mimiflynn/react-starter-kit,emil-alexandrescu/react-starter-kit,syarul/react-starter-kit,f15gdsy/react-starter-kit,wseo88/react-starter-kit,jeffreymoya/react-starter-kit,schnerd/react-starter-kit,epicallan/akilihub,pitLancer/pbdorb,bogdosarov/link_share,jifeon/react-starter-kit,Demesheo/react-starter-kit,Creatrixino/react-starter-kit,eugeneross/react-starter-kit,nambawan/g-old,seanlin816/react-starter-kit,mlem8/dev-challenge,jifeon/react-starter-kit,tcrosen/react-vehicle-builder,mikemunsie/react-starter-kit,albperezbermejo/react-starter-kit,domenicosolazzo/react-starter-kit,petarslovic/bas-info,aos2006/tesDeploy,concerned3rdparty/react-starter-kit,Fedulab/FeduLab,rodolfo2488/react-starter-kit,wanchopen/vida,servak/material-ui-sample,sallen450/react-starter-kit,rodolfo2488/react-starter-kit,dabrowski-adam/react-isomorphic,Mobiletainment/react-starter-kit,jeffreymoya/react-starter-kit,mattroid/turboiep,akfreas/ReactTest,chentaixu/react-starter-kit,roskom/MyApp,pandoraui/react-starter,youprofit/react-starter-kit,DanielHabib/onboarding,Bogdaan/react-auth-kit,BrianGenisio/gobus,zbrukas/wwf-store,vishwanatharondekar/resume,jessamynsmith/MintWebApp,chentaixu/react-starter-kit,aalluri-navaratan/react-starter-kit,Jose4gg/GSW-P2,maysale01/react-starter-kit,LukevdPalen/react-starter-kit,RenRenTeam/react-starter-kit,mzgnr/react-starter-kit,zhiyelee/react-starter-kit,nicolasmoise/QH-code-exercize,samdenicola/react-starter-kit,fustic/here-hackaton,onelink-translations/react-localization,jhlav/mpn-web-app,zerubeus/voicifix,pvijeh/stock-tracking-app-reactjs,cheapsteak/react-starter-kit,dbkbali/react-starter-kit,poeschko/ask-refugeescode,TodoWishlist/TodoWishlist,loganfreeman/react-is-fun,lycandjava/react-starter-kit,iamfrontender/resume,Malinin88/SaratovJS,DVLP/react-starter-kit,youprofit/react-starter-kit,neozhangthe1/react-starter-kit,pvijeh/isomorphic-react-local-discovery,tlin108/chaf,yinaw/travelBook,alexmasselot/react-starter-kit,langpavel/react-starter-kit,ademuk/react-starter-kit,nagyistoce/react-starter-kit,vladikoff/react-starter-kit,zmj1316/InfomationVisualizationCourseWork,leeleo26/react-starter-kit,sherlock221/react-starter-kit,pawsong/react-starter-kit,royriojas/react-starter-kit,RomanovRoman/react-starter-kit,arkeros/react-native-starter-kit,nagyistoce/react-starter-kit,aaron-goshine/react-starter-kit,chytanya/microcredentials-client,DaveyEdwards/myiworlds,Gabs00/react-starter-kit,victoryancn/react-starter-kit,servak/material-ui-sample,tcrosen/nhl-scores,petarslovic/bas-info,Frenzzy/react-starter-kit,aries-auto/ariesautomotive,vanessadyce/react-proto,andmilj/vip-transfers,piscis/react-starter-kit,daviferreira/react-starter-kit,Speak-Easy/web-app,nextinnovation-corp/gacha,HildoBijl/DondersHackathonTR,syarul/react-starter-kit,nicolasmoise/QH-code-exercize,BrettHoyer/fatwithfriends,mithundas79/react-starter-kit,TCotton/penny-books,vanbujm/react-css-animation-practice,tomesposito/blog,miketamis/CaughtHere,mortenryum/loanCalculator,ACPK/react-starter-kit,Speak-Easy/web-app,BringJacket/www,nextinnovation-corp/gacha,epylinkn/monument,uptive/react-starter-kit,mikemunsie/react-starter-kit,bogdosarov/link_share,kaynenh/ReactBudget,jsivakumaran/map-app,geoffreyfloyd/op,nicolasmoise/CMC-2,RenRenTeam/react-starter-kit,pppp22591558/ChinaPromotion,mimiflynn/react-starter-kit,agiron123/react-starter-kit-TDDOList,Jose4gg/GSW-P2,tinwaisi/take-home,ziedAb/PVMourakiboun,DanielHabib/HowManyBalloons,epicallan/akilihub,epylinkn/monument,vishwanatharondekar/resume,arkeros/react-native-starter-kit,N4N0/resume,pvijeh/stock-tracking-app-reactjs,tstangenberg/apitest-editor,ronlobo/react-starter-kit,miketamis/locationPositioning,shaunstanislaus/react-starter-kit,eugeneross/react-starter-kit,mattroid/turboiep,murphysierra/VinnyStoryPage,erichardson30/react-starter,ajhsu/react-starter-kit,p-a/react-starter-kit,yjzzcao/react-starter-kit,janusnic/react-starter-kit,allfix53/react-starter-kit,0xcdc/rfb-client-app,dbkbali/react-starter-kit,BenRichter/app2,SlexAxton/oddjobsf,erichardson30/react-starter,miketamis/locationPositioning,leeleo26/react-starter-kit,mithundas79/react-starter-kit,jhabdas/lumpenradio-com,maysale01/react-starter-kit,mDinner/musicansAssistant,iteacat/cc_deals,i3ringit/mdelc,lycandjava/react-starter-kit,takahashik/todo-app,stinkyfingers/IsoTest,waelio/react-starter-kit,bopeng87/reactfullstack,jaruesink/ruesinkdds,jsDotCr/memory,carlosCeron/react-starter-kit,allfix53/react-starter-kit,cheapsteak/react-starter-kit,geoffreyfloyd/op,jackinf/skynda.me,koistya/react-starter-kit,maximhoffman/beginnertuts,cineindustria/site,fustic/here-hackaton,DanielHabib/HowManyBalloons,emil-alexandrescu/react-starter-kit,jbsouvestre/react-starter-kit,kaushik94/react-starter,vanbujm/react-css-animation-practice,shaialon/react-starter-kit,ynu/ecard-wxe,samkguerrero/samkguerrero_react,SOCLE15/carpoule,nambawan/g-old,jbsouvestre/react-starter-kit,como-quesito/react-starter-kit,jsDotCr/memory,gokberkisik/react-starter-kit,bbonny/movie-matching,ubien/react-starter-kit,agiron123/react-starter-kit-TDDOList,swhite24/react-starter-kit,labzero/lunch,BlakeRxxk/react-starter-kit,yjzzcao/react-starter-kit,fkn/ndo,ryanherlihy/react-starter-kit,BringJacket/www,vladikoff/react-starter-kit,Malinin88/SaratovJS,tcrosen/react-vehicle-builder,saadanerdetbare/react-starter-kit,jshultz/secret_project,ademuk/react-starter-kit,nobesnickr/react-starter-kit,SFDevLabs/react-starter-kit,solome/react-starter-kit,daviferreira/react-starter-kit,arkeros/react-native-starter-kit,N4N0/resume,clickbuster/smite-calculator