feat(travis): Speed up builds on Travis (#1010)
feat(travis): Speed up builds on Travis (#1010)

Remove travis sudo (use chromium) and cache node_modules, speeds up Travis builds by ~30%
haithemT/app-test,haxorbit/chiron,AnhHT/react-boilerplate,gihrig/react-boilerplate-logic,kaizen7-nz/gold-star-chart,TheTopazWombat/levt-2,rlagman/raphthelagman,Demonslyr/Donut.WFE.Customer,kossel/react-boilerplate,JonathanMerklin/react-boilerplate,Dattaya/react-boilerplate-object,Dattaya/react-boilerplate-object,Dmitry-N-Medvedev/motor-collection,shiftunion/bot-a-tron,perry-ugroop/ugroop-react-dup2,gihrig/react-boilerplate,blockfs/frontend-react,Proxiweb/react-boilerplate,gtct/wallet.eine.com,pauleonardo/demo-trans,rlagman/raphthelagman,TheTopazWombat/levt-2,Demonslyr/Donut.WFE.Customer,mmaedel/react-boilerplate,react-boilerplate/react-boilerplate,romanvieito/ball-simpler,perry-ugroop/ugroop-react-dup2,blockfs/frontend-react,samit4me/react-boilerplate,Dmitry-N-Medvedev/motor-collection,KarandikarMihir/react-boilerplate,mikejong0815/Temp,kossel/react-boilerplate,tomazy/react-boilerplate,mxstbr/react-boilerplate,chaintng/react-boilerplate,gihrig/react-boilerplate,mxstbr/react-boilerplate,Jan-Jan/react-hackathon-boilerplate,Jan-Jan/react-hackathon-boilerplate,pauleonardo/demo-trans,Proxiweb/react-boilerplate,mmaedel/react-boilerplate,ipselon/react-boilerplate-clone,KarandikarMihir/react-boilerplate,haithemT/app-test,likesalmon/likesalmon-react-boilerplate,gtct/wallet.eine.com,likesalmon/likesalmon-react-boilerplate,gihrig/react-boilerplate-logic,AnhHT/react-boilerplate,kaizen7-nz/gold-star-chart,gtct/wallet.eine.com,be-oi/beoi-training-client,JonathanMerklin/react-boilerplate,abasalilov/react-boilerplate,Dmitry-N-Medvedev/motor-collection,mikejong0815/Temp,ipselon/react-boilerplate-clone,gtct/wallet.eine.com,react-boilerplate/react-boilerplate,abasalilov/react-boilerplate,haxorbit/chiron,tomazy/react-boilerplate,be-oi/beoi-training-client,chaintng/react-boilerplate,Proxiweb/react-boilerplate,romanvieito/ball-simpler,shiftunion/bot-a-tron,Dmitry-N-Medvedev/motor-collection,samit4me/react-boilerplate