Add Nodejs 5.1 to travis config
Add Nodejs 5.1 to travis config

Also update from Nodejs 4.1 to 4.2 which is LTS version.

gertcuykens/polymer-starter-kit,trendystore/store,gianluka79/First,markovuksanovic/polymer-starter-kit,stefanoantonel/ecofit,michaetto/f16,stephenzsy/charon-frontend,Serious-Rage/poligomy,gertcuykens/polymer-starter-kit,grebett/polymer-starter-kit,gertcuykens/polymer-starter-kit,SB-Technology-Holdings-International/WateringWebClient,Ex-ante-Labs/shopper.ninja,Ex-ante-Labs/pivot-ahead,JnJSW/dttdata,flaiker/polymer-starter-kit,RoyKoh/Project-3,victorgb6/id-questionary,StartPolymer/polymer-starter-kit-plus,stefanoantonel/ecofit,StartPolymer/polymer-starter-kit-plus,RoyKoh/Project-3,gick/reveries-project,stephenzsy/charon-frontend,michaetto/f16,Sykkro/penny-web,trendystore/store,klarkc/polymer-loopback-starter-kit,stefanoantonel/ecofit,SB-Technology-Holdings-International/Water,plusCubed/pluscubed-site,ragingwind/polymer-starter-kit,abdonrd/polymer-starter-kit,gick/mobile-polymer-starter-2,gick/reveries-project,SB-Technology-Holdings-International/Water,stefanoantonel/brainpower,michaetto/f16,anthonybrown/polymer-starter-kit,SB-Technology-Holdings-International/Water,ragingwind/polymer-starter-kit,gianluka79/First,gick/reveries-project,FaellCarvalho/Geo-Location,Sykkro/penny-web,StartPolymer/polymer-starter-kit,klarkc/polymer-loopback-starter-kit,gick/mobile-polymer-starter-2,SB-Technology-Holdings-International/WateringWebClient,Ex-ante-Labs/shopper.ninja,stephenzsy/charon-frontend,semafloor/semafloor-test-alpha,SB-Technology-Holdings-International/WateringWebClient,alexpaluzzi/polymer-starter-kit,victorgb6/id-questionary,Negashev/negash.ru,gianluka79/First,anthonybrown/polymer-starter-kit,Ex-ante-Labs/pivot-ahead,lordoftheflies/mlm-portal,grebett/polymer-starter-kit,felixzapata/polymer-starter-kit,plusCubed/pluscubed-site,FaellCarvalho/Geo-Location,klarkc/polymer-loopback-starter-kit,Negashev/negash.ru,JnJSW/dttdata,felixzapata/polymer-starter-kit,SB-Technology-Holdings-International/Water,mtusk/polymer-starter-kit,SB-Technology-Holdings-International/Water,andrefuller/PolymerTrailerViewer,semafloor/semafloor-test-alpha,SB-Technology-Holdings-International/WateringWebClient,lordoftheflies/mlm-portal,markovuksanovic/polymer-starter-kit,andrefuller/PolymerTrailerViewer,RoyKoh/Project-3,Sykkro/penny-web,markovuksanovic/polymer-starter-kit,JnJSW/dttdata,victorgb6/id-questionary,trendystore/store,Serious-Rage/poligomy,abdonrd/polymer-starter-kit,flaiker/polymer-starter-kit,Negashev/negash.ru,alexpaluzzi/polymer-starter-kit,lordoftheflies/mlm-portal,alexpaluzzi/polymer-starter-kit,mtusk/polymer-starter-kit,Serious-Rage/poligomy,ragingwind/polymer-starter-kit,StartPolymer/polymer-starter-kit,FaellCarvalho/Geo-Location,semafloor/semafloor-test-alpha,andrefuller/PolymerTrailerViewer,gick/mobile-polymer-starter-2,stefanoantonel/brainpower,grebett/polymer-starter-kit,felixzapata/polymer-starter-kit