Add rails 4.2 to Travis config
Add rails 4.2 to Travis config

ASnow/jbuilder,WellframeInc/jbuilder,odedniv/jbuilder,suryasnath/Venture,maclover7/jbuilder,vincentwoo/jbuilder,rails/jbuilder,sue445/jbuilder,jasnow/jbuilder,nambrot/jbuilder