Added Grunt and Travis files for JSHint and other checking; modified .gitignore accordingly
Added Grunt and Travis files for JSHint and other checking; modified .gitignore accordingly

tsruban/samples,Edward-Shawn/samples,shelsonjava/samples,oliverhuangchao/samples,virajs/apprtc,taylor-b/samples,aadebuger/docker-apprtc,82488059/apprtc,samdutton/apprtc,shelsonjava/apprtc,smbale/samples,4lejandrito/adapter,bemasc/samples,mauricionr/samples,harme199497/adapter,Roarz/samples,keshwans/samples,arnauorriols/apprtc,virajs/testrtc,leehz/samples,ralic/samples,jessetane/testrtc,mvenkatesh431/apprtc,ralic/testrtc,bbandaru/samples,samdutton/apprtc,shelsonjava/testrtc,leehz/samples,smayoorans/samples,fetterov/samples,dajise/samples,xdumaine/samples,jan-ivar/adapter,MahmoudFouad/samples,knightsofaa/webrtc,fippo/webrtc,shaohung001/samples,oliverhuangchao/samples,EmreAkkoyun/sample,shelsonjava/apprtc,82488059/apprtc,jjrasche/cell-based-RC-control,todotobe1/apprtc,harme199497/adapter,YouthAndra/apprtc,TribeMedia/apprtc,YouthAndra/apprtc,procandi/apprtc,82488059/apprtc,ralic/testrtc,aadebuger/docker-apprtc,smadhusu/AppRTC,virajs/testrtc,shines/adapter,volkanh/volkanh.github.io,smadhusu/AppRTC,jiayliu/apprtc,dengshaodong/docker-apprtc,askdaddy/samples,4lejandrito/adapter,procandi/apprtc,Acidburn0zzz/adapter,shelsonjava/samples,mvenkatesh431/apprtc,mvenkatesh431/samples,webrtc/adapter,volkanh/volkanh.github.io,JiYou/apprtc,procandi/samples,procandi/samples,mvenkatesh431/samples,bpyoung92/apprtc,procandi/apprtc,jarl-alejandro/apprtc,jiayliu/apprtc,TribeMedia/apprtc,mvenkatesh431/apprtc,webrtc/adapter,fippo/apprtc,JiYou/apprtc,82488059/apprtc,shelsonjava/testrtc,fippo/apprtc,xdumaine/samples,jessetane/testrtc,mvenkatesh431/apprtc,aadebuger/docker-apprtc,Roarz/samples,todotobe1/apprtc,guoweis/webrtc,webrtc/samples,webrtc/apprtc,calebboyd/adapter,tsruban/samples,arnauorriols/apprtc,leehz/samples,webrtc/apprtc,shaohung001/samples,virajs/samples,shelsonjava/apprtc,martin7890/samples,shelsonjava/apprtc,mulyoved/samples,TheKnarf/apprtc,oliverhuangchao/samples,samdutton/apprtc,akashrchoksi/newone,myself659/samples,MahmoudFouad/samples,askdaddy/samples,xdumaine/adapter,Zauberstuhl/adapter,TribeMedia/testrtc,TribeMedia/testrtc,ralic/testrtc,Acidburn0zzz/adapter,smbale/samples,jarl-alejandro/apprtc,TheKnarf/apprtc,virajs/apprtc,TheKnarf/apprtc,pquochoang/samples,Roarz/samples,dengshaodong/docker-apprtc,fitraditya/samples,TribeMedia/samples,kod3r/samples,shelsonjava/testrtc,TribeMedia/apprtc,fitraditya/samples,samdutton/webrtc,arnauorriols/apprtc,bbandaru/samples,4lejandrito/adapter,aadebuger/docker-apprtc,bemasc/samples,fitraditya/samples,harme199497/adapter,virajs/apprtc,overtakermtg/samples,TheKnarf/apprtc,jiayliu/apprtc,fippo/apprtc,samdutton/webrtc,dajise/samples,JiYou/apprtc,pquochoang/samples,todotobe1/samples,fippo/apprtc,myself659/samples,akashrchoksi/newone,MahmoudFouad/samples,smayoorans/samples,JiYou/apprtc,volkanh/volkanh.github.io,fetterov/samples,virajs/testrtc,bemasc/samples,samdutton/apprtc,b-cuts/samples,Edward-Shawn/samples,TribeMedia/samples,overtakermtg/samples,shelsonjava/testrtc,dengshaodong/docker-apprtc,jan-ivar/samples,Edward-Shawn/samples,todotobe1/apprtc,procandi/apprtc,webrtc/testrtc,jessetane/testrtc,xdumaine/samples,knightsofaa/webrtc,keshwans/samples,jarl-alejandro/apprtc,bpyoung92/apprtc,todotobe1/samples,smadhusu/AppRTC,fippo/apprtc,guoweis/webrtc,Zauberstuhl/adapter,todotobe1/apprtc,82488059/apprtc,procandi/apprtc,tsruban/samples,webrtc/apprtc,dushmis/webrtc,mauricionr/samples,YouthAndra/apprtc,shines/adapter,bpyoung92/apprtc,dajise/samples,virajs/apprtc,shelsonjava/samples,bbandaru/samples,diddie06/webrtc,jjrasche/cell-based-RC-control,dengshaodong/docker-apprtc,dushmis/webrtc,jan-ivar/samples,mauricionr/samples,samdutton/apprtc,YouthAndra/apprtc,shelsonjava/apprtc,TribeMedia/apprtc,ralic/samples,kod3r/samples,xdumaine/adapter,EmreAkkoyun/sample,procandi/samples,pquochoang/samples,mvenkatesh431/apprtc,jarl-alejandro/apprtc,martin7890/samples,TribeMedia/apprtc,smayoorans/samples,b-cuts/samples,mulyoved/samples,jiayliu/apprtc,martin7890/samples,kod3r/samples,TribeMedia/samples,shines/adapter,juberti/samples,jjrasche/cell-based-RC-control,b-cuts/samples,smadhusu/AppRTC,TheKnarf/apprtc,bpyoung92/apprtc,webrtc/testrtc,jan-ivar/adapter,calebboyd/adapter,bpyoung92/apprtc,virajs/testrtc,arnauorriols/apprtc,akashrchoksi/newone,mulyoved/samples,guoweis/webrtc,EmreAkkoyun/sample,virajs/apprtc,webrtc/apprtc,jarl-alejandro/apprtc,YouthAndra/apprtc,jjrasche/cell-based-RC-control,dengshaodong/docker-apprtc,jessetane/testrtc,JiYou/apprtc,Acidburn0zzz/adapter,aadebuger/docker-apprtc,fippo/webrtc,TribeMedia/testrtc,overtakermtg/samples,virajs/samples,juberti/samples,mvenkatesh431/samples,arnauorriols/apprtc,Zauberstuhl/adapter,myself659/samples,ralic/samples,webrtc/apprtc,todotobe1/samples,taylor-b/samples,smbale/samples,ralic/testrtc,TribeMedia/testrtc,todotobe1/apprtc,calebboyd/adapter,diddie06/webrtc,smadhusu/AppRTC,virajs/samples,jiayliu/apprtc,webrtc/samples,fetterov/samples