[ZEPPELIN-281] Windows7 build2
[ZEPPELIN-281] Windows7 build2

### What is this PR for?
For next release I would like to do simple additions to my proxy setup on main README:
- Add Maven proxy configuration example.
- Add note on Bower main repository (just for zeppelin-web module) [1].

[1] Currently, there is no way to reach Bower main repository through NTLM proxy (no matter what you put in your .bowerrc). The problem is `Request failed with ECONNRESET`. Let me know if someone can build zeppelin-web behind NTLM proxy .

### What type of PR is it?
Documentation

### What is the Jira issue?
ZEPPELIN-281 (closed)

### How should this be tested?
No tests, just check README, proxy settings paragraph.

### Questions:
* Does the licenses files need update? no
* Is there breaking changes for older versions? no
* Does this needs documentation? no

Author: fvaleri <fedevaleri@gmail.com>

Closes #1069 from fvaleri/windows7-build2 and squashes the following commits:

065e3f3 [fvaleri] Add Maven proxy configuration. Add Bower NTLM proxy note.

AlexanderShoshin/zeppelin,optimizely/incubator-zeppelin,lresende/incubator-zeppelin,rerngvit/incubator-zeppelin,SarunasG/zeppelin-oidc,tinkoff-dwh/zeppelin,zjffdu/zeppelin,YuanGunGun/zeppelin,tzolov/incubator-zeppelin,Solution-Global/zeppelin,vipul1409/zeppelin,Leemoonsoo/zeppelin,SachinJanani/zeppelin,soralee/zeppelin,digitalreasoning/incubator-zeppelin,volumeint/zeppelin,apache/incubator-zeppelin,yu74n/zeppelin,herval/zeppelin,minahlee/incubator-zeppelin,zjffdu/zeppelin,pellmont/zeppelin,joroKr21/incubator-zeppelin,SachinJanani/zeppelin,raysteam/zeppelin,prabhjyotsingh/incubator-zeppelin,Leemoonsoo/incubator-zeppelin,fogbeam/zeppelin_mirror,apache/incubator-zeppelin,joroKr21/incubator-zeppelin,radicalbit/incubator-zeppelin,chilang/zeppelin,yu74n/zeppelin,pellmont/zeppelin,mfelgamal/zeppelin,lresende/incubator-zeppelin,onkarshedge/incubator-zeppelin,prabhjyotsingh/zeppelin,Altiscale/incubator-zeppelin,Solution-Global/zeppelin,herval/zeppelin,astroshim/zeppelin,astroshim/zeppelin,Madhuka/incubator-zeppelin,Altiscale/incubator-zeppelin,soralee/zeppelin,astroshim/zeppelin,SarunasG/zeppelin-oidc,mfelgamal/zeppelin,vipul1409/zeppelin,onkarshedge/incubator-zeppelin,Solution-Global/zeppelin,volumeint/zeppelin,datalayer/zeppelin-datalayer,prabhjyotsingh/zeppelin,raysteam/zeppelin,anthonycorbacho/incubator-zeppelin,volumeint/zeppelin,mwpenny/zeppelin-esri,minahlee/incubator-zeppelin,SachinJanani/zeppelin,zetaris/zeppelin,raysteam/zeppelin,AlexanderShoshin/zeppelin,1ambda/zeppelin,karuppayya/zeppelin,SarunasG/zeppelin-oidc,anthonycorbacho/incubator-zeppelin,astroshim/zeppelin,joroKr21/incubator-zeppelin,SarunasG/zeppelin-oidc,sergeymazin/zeppelin,tinkoff-dwh/zeppelin,zetaris/zeppelin,Madhuka/incubator-zeppelin,wary/zeppelin,vgmartinez/incubator-zeppelin,r-kamath/incubator-zeppelin,raysteam/zeppelin,1ambda/zeppelin,mfelgamal/zeppelin,prabhjyotsingh/incubator-zeppelin,Leemoonsoo/zeppelin,mwpenny/zeppelin-esri,mwkang/zeppelin,pellmont/zeppelin,mwpenny/zeppelin-esri,pravin-dsilva/zeppelin,radicalbit/incubator-zeppelin,mwkang/zeppelin,Leemoonsoo/zeppelin,apache/incubator-zeppelin,optimizely/incubator-zeppelin,radicalbit/incubator-zeppelin,tzolov/incubator-zeppelin,digitalreasoning/incubator-zeppelin,namanmishra91/zeppelin,lresende/incubator-zeppelin,sctincman/zeppelin,astroshim/zeppelin,digitalreasoning/incubator-zeppelin,vgmartinez/incubator-zeppelin,sravan-s/zeppelin,pellmont/zeppelin,rconline/zeppelin,sravan-s/zeppelin,VipinRathor/zeppelin,minahlee/zeppelin,minahlee/zeppelin,onkarshedge/incubator-zeppelin,datalayer/zeppelin,SachinJanani/zeppelin,sravan-s/zeppelin,YuanGunGun/zeppelin,jongyoul/incubator-zeppelin,namanmishra91/zeppelin,astroshim/incubator-zeppelin,sohaibiftikhar/zeppelin,digitalreasoning/incubator-zeppelin,r-kamath/zeppelin,AlexanderShoshin/zeppelin,tillrohrmann/incubator-zeppelin,r-kamath/zeppelin,r-kamath/zeppelin,openthings/zeppelin,cquptEthan/incubator-zeppelin,tzolov/incubator-zeppelin,cfries/zeppelin,r-kamath/zeppelin,wary/zeppelin,onkarshedge/incubator-zeppelin,digitalreasoning/incubator-zeppelin,jongyoul/incubator-zeppelin,jongyoul/zeppelin,Altiscale/incubator-zeppelin,1ambda/zeppelin,digitalreasoning/incubator-zeppelin,sergeymazin/zeppelin,minahlee/zeppelin,wary/zeppelin,tinkoff-dwh/zeppelin,vipul1409/zeppelin,Solution-Global/zeppelin,SachinJanani/zeppelin,datalayer/zeppelin,pellmont/zeppelin,spacewalkman/incubator-zeppelin,mwpenny/zeppelin-esri,datalayer/zeppelin-datalayer,karuppayya/zeppelin,vgmartinez/incubator-zeppelin,mwkang/zeppelin,vrlo/zeppelin,herval/zeppelin,sctincman/zeppelin,vipul1409/zeppelin,sravan-s/zeppelin,rerngvit/incubator-zeppelin,onkarshedge/incubator-zeppelin,prabhjyotsingh/incubator-zeppelin,cquptEthan/incubator-zeppelin,Solution-Global/zeppelin,SarunasG/zeppelin-oidc,VipinRathor/zeppelin,namanmishra91/zeppelin,tzolov/incubator-zeppelin,anthonycorbacho/incubator-zeppelin,hkropp/incubator-zeppelin,karuppayya/zeppelin,sergeymazin/zeppelin,zetaris/zeppelin,benoyantony/zeppelin,fogbeam/zeppelin_mirror,doanduyhai/incubator-zeppelin,Leemoonsoo/zeppelin,sohaibiftikhar/zeppelin,sctincman/zeppelin,cfries/zeppelin,IceKhan13/zeppelin,datalayer/zeppelin,yorek/zeppelin,sctincman/zeppelin,zjffdu/zeppelin,r-kamath/incubator-zeppelin,sergeymazin/zeppelin,anthonycorbacho/incubator-zeppelin,pravin-dsilva/zeppelin,jongyoul/zeppelin,digitalreasoning/incubator-zeppelin,SarunasG/zeppelin-oidc,yu74n/zeppelin,pravin-dsilva/zeppelin,VipinRathor/zeppelin,Madhuka/incubator-zeppelin,datalayer/zeppelin,anthonycorbacho/incubator-zeppelin,jongyoul/incubator-zeppelin,Leemoonsoo/incubator-zeppelin,pellmont/zeppelin,radicalbit/incubator-zeppelin,Nova-Boy/zeppelin,mfelgamal/zeppelin,yu74n/zeppelin,tinkoff-dwh/zeppelin,mwkang/zeppelin,sohaibiftikhar/zeppelin,prabhjyotsingh/incubator-zeppelin,openthings/zeppelin,Solution-Global/zeppelin,SarunasG/zeppelin-oidc,datalayer/zeppelin,datalayer/zeppelin,SachinJanani/zeppelin,rconline/zeppelin,yu74n/zeppelin,doanduyhai/incubator-zeppelin,apache/zeppelin,sctincman/zeppelin,1ambda/zeppelin,VipinRathor/zeppelin,benoyantony/zeppelin,Nova-Boy/zeppelin,openthings/zeppelin,1ambda/zeppelin,benoyantony/zeppelin,zjffdu/zeppelin,rerngvit/incubator-zeppelin,rconline/zeppelin,sctincman/zeppelin,apache/incubator-zeppelin,spacewalkman/incubator-zeppelin,joroKr21/incubator-zeppelin,doanduyhai/incubator-zeppelin,karuppayya/zeppelin,chilang/zeppelin,yu74n/zeppelin,soralee/zeppelin,Leemoonsoo/zeppelin,tzolov/incubator-zeppelin,Leemoonsoo/zeppelin,fogbeam/zeppelin_mirror,1ambda/zeppelin,optimizely/incubator-zeppelin,YuanGunGun/zeppelin,r-kamath/incubator-zeppelin,hammertank/zeppelin,jongyoul/zeppelin,cquptEthan/incubator-zeppelin,astroshim/incubator-zeppelin,benoyantony/zeppelin,jongyoul/zeppelin,hammertank/zeppelin,AlexanderShoshin/zeppelin,r-kamath/zeppelin,cquptEthan/incubator-zeppelin,mwkang/zeppelin,Nova-Boy/zeppelin,wary/zeppelin,AlexanderShoshin/zeppelin,cquptEthan/incubator-zeppelin,IceKhan13/zeppelin,chilang/zeppelin,apache/incubator-zeppelin,jongyoul/incubator-zeppelin,minahlee/incubator-zeppelin,Solution-Global/zeppelin,zetaris/zeppelin,jongyoul/zeppelin,openthings/zeppelin,vipul1409/zeppelin,prabhjyotsingh/zeppelin,openthings/zeppelin,doanduyhai/incubator-zeppelin,YuanGunGun/zeppelin,tinkoff-dwh/zeppelin,astroshim/incubator-zeppelin,mfelgamal/zeppelin,apache/zeppelin,raysteam/zeppelin,AlexanderShoshin/zeppelin,yorek/zeppelin,soralee/zeppelin,tillrohrmann/incubator-zeppelin,yorek/zeppelin,rconline/zeppelin,SachinJanani/zeppelin,prabhjyotsingh/incubator-zeppelin,tillrohrmann/incubator-zeppelin,volumeint/zeppelin,astroshim/incubator-zeppelin,minahlee/zeppelin,Madhuka/incubator-zeppelin,sergeymazin/zeppelin,YuanGunGun/zeppelin,mwpenny/zeppelin-esri,zetaris/zeppelin,pravin-dsilva/zeppelin,volumeint/zeppelin,rerngvit/incubator-zeppelin,zjffdu/zeppelin,chilang/zeppelin,Nova-Boy/zeppelin,mfelgamal/zeppelin,IceKhan13/zeppelin,Leemoonsoo/incubator-zeppelin,Leemoonsoo/zeppelin,tzolov/incubator-zeppelin,sergeymazin/zeppelin,anthonycorbacho/incubator-zeppelin,Leemoonsoo/incubator-zeppelin,doanduyhai/incubator-zeppelin,raysteam/zeppelin,vrlo/zeppelin,zetaris/zeppelin,fogbeam/zeppelin_mirror,radicalbit/incubator-zeppelin,1ambda/zeppelin,joroKr21/incubator-zeppelin,spacewalkman/incubator-zeppelin,yorek/zeppelin,chilang/zeppelin,IceKhan13/zeppelin,hammertank/zeppelin,hkropp/incubator-zeppelin,vgmartinez/incubator-zeppelin,vrlo/zeppelin,minahlee/zeppelin,Altiscale/incubator-zeppelin,wary/zeppelin,Leemoonsoo/incubator-zeppelin,yorek/zeppelin,minahlee/zeppelin,vipul1409/zeppelin,fogbeam/zeppelin_mirror,cfries/zeppelin,chilang/zeppelin,mfelgamal/zeppelin,mwpenny/zeppelin-esri,astroshim/incubator-zeppelin,tillrohrmann/incubator-zeppelin,onkarshedge/incubator-zeppelin,sohaibiftikhar/zeppelin,zjffdu/zeppelin,zjffdu/zeppelin,namanmishra91/zeppelin,hammertank/zeppelin,VipinRathor/zeppelin,namanmishra91/zeppelin,prabhjyotsingh/zeppelin,apache/zeppelin,sravan-s/zeppelin,joroKr21/incubator-zeppelin,minahlee/incubator-zeppelin,doanduyhai/incubator-zeppelin,jongyoul/incubator-zeppelin,tillrohrmann/incubator-zeppelin,pellmont/zeppelin,prabhjyotsingh/incubator-zeppelin,Madhuka/incubator-zeppelin,rerngvit/incubator-zeppelin,apache/zeppelin,karuppayya/zeppelin,sohaibiftikhar/zeppelin,r-kamath/incubator-zeppelin,IceKhan13/zeppelin,optimizely/incubator-zeppelin,prabhjyotsingh/zeppelin,mwkang/zeppelin,sohaibiftikhar/zeppelin,Leemoonsoo/incubator-zeppelin,yorek/zeppelin,namanmishra91/zeppelin,minahlee/incubator-zeppelin,pravin-dsilva/zeppelin,prabhjyotsingh/zeppelin,vrlo/zeppelin,rconline/zeppelin,sergeymazin/zeppelin,datalayer/zeppelin-datalayer,VipinRathor/zeppelin,hammertank/zeppelin,YuanGunGun/zeppelin,spacewalkman/incubator-zeppelin,tillrohrmann/incubator-zeppelin,volumeint/zeppelin,rerngvit/incubator-zeppelin,AlexanderShoshin/zeppelin,zetaris/zeppelin,lresende/incubator-zeppelin,yorek/zeppelin,mwkang/zeppelin,spacewalkman/incubator-zeppelin,sohaibiftikhar/zeppelin,optimizely/incubator-zeppelin,benoyantony/zeppelin,vrlo/zeppelin,optimizely/incubator-zeppelin,fogbeam/zeppelin_mirror,r-kamath/zeppelin,Nova-Boy/zeppelin,soralee/zeppelin,vgmartinez/incubator-zeppelin,openthings/zeppelin,tinkoff-dwh/zeppelin,onkarshedge/incubator-zeppelin,lresende/incubator-zeppelin,vrlo/zeppelin,vrlo/zeppelin,Nova-Boy/zeppelin,hammertank/zeppelin,hkropp/incubator-zeppelin,radicalbit/incubator-zeppelin,joroKr21/incubator-zeppelin,openthings/zeppelin,rerngvit/incubator-zeppelin,vgmartinez/incubator-zeppelin,pravin-dsilva/zeppelin,jongyoul/zeppelin,datalayer/zeppelin-datalayer,fogbeam/zeppelin_mirror,apache/zeppelin,sctincman/zeppelin,cfries/zeppelin,doanduyhai/incubator-zeppelin,r-kamath/incubator-zeppelin,herval/zeppelin,soralee/zeppelin,karuppayya/zeppelin,rconline/zeppelin,Madhuka/incubator-zeppelin,spacewalkman/incubator-zeppelin,vipul1409/zeppelin,lresende/incubator-zeppelin,mwpenny/zeppelin-esri,jongyoul/zeppelin,cfries/zeppelin,Leemoonsoo/zeppelin,cfries/zeppelin,IceKhan13/zeppelin,hammertank/zeppelin,radicalbit/incubator-zeppelin,wary/zeppelin,jongyoul/incubator-zeppelin,sravan-s/zeppelin,apache/zeppelin,hkropp/incubator-zeppelin,karuppayya/zeppelin,sravan-s/zeppelin,Nova-Boy/zeppelin,pravin-dsilva/zeppelin,hkropp/incubator-zeppelin,namanmishra91/zeppelin,raysteam/zeppelin,astroshim/zeppelin,r-kamath/incubator-zeppelin,r-kamath/incubator-zeppelin,IceKhan13/zeppelin,r-kamath/zeppelin,volumeint/zeppelin,cquptEthan/incubator-zeppelin,anthonycorbacho/incubator-zeppelin,herval/zeppelin,Altiscale/incubator-zeppelin,benoyantony/zeppelin,cfries/zeppelin,chilang/zeppelin,astroshim/incubator-zeppelin,wary/zeppelin,tinkoff-dwh/zeppelin,lresende/incubator-zeppelin,hkropp/incubator-zeppelin,cquptEthan/incubator-zeppelin,herval/zeppelin,yu74n/zeppelin,rconline/zeppelin,minahlee/zeppelin,VipinRathor/zeppelin,soralee/zeppelin,spacewalkman/incubator-zeppelin,astroshim/zeppelin,joroKr21/incubator-zeppelin,prabhjyotsingh/zeppelin,datalayer/zeppelin,Altiscale/incubator-zeppelin,apache/zeppelin,benoyantony/zeppelin,Madhuka/incubator-zeppelin,apache/incubator-zeppelin,tillrohrmann/incubator-zeppelin,herval/zeppelin,YuanGunGun/zeppelin,optimizely/incubator-zeppelin