cache bower dependencies on Travis
cache bower dependencies on Travis

Summary: shaves a little time off of our travis runs by moving the bower cache from `~/.bower/` to `~/.flow_cache/.bower/`, so it gets picked up by the caching between runs.

Reviewed By: gabelevi

Differential Revision: D3259237

fb-gh-sync-id: e5e95cec7ae2bcf721e805c72da58804ed86986b
fbshipit-source-id: e5e95cec7ae2bcf721e805c72da58804ed86986b

samwgoldman/flow,TiddoLangerak/flow,samwgoldman/flow,gabelevi/flow,AgentME/flow,facebook/flow,AgentME/flow,gabelevi/flow,jamesgpearce/flow,jgrund/flow,ylu1317/flow,mroch/flow,facebook/flow,jeffmo/flow,AgentME/flow,claudiopro/flow,AprilArcus/flow,chenglou/flow,AprilArcus/flow,gabelevi/flow,jdelStrother/flow,facebook/flow,jamesgpearce/flow,gabro/flow,jamesgpearce/flow,jgrund/flow,mroch/flow,gabelevi/flow,cesarandreu/flow,AprilArcus/flow,gabro/flow,popham/flow,gabelevi/flow,ylu1317/flow,mroch/flow,popham/flow,fletcherw/flow,AgentME/flow,chenglou/flow,fletcherw/flow,nmote/flow,jdelStrother/flow,nmote/flow,JonathanUsername/flow,claudiopro/flow,claudiopro/flow,jdelStrother/flow,fletcherw/flow,jgrund/flow,samwgoldman/flow,nmote/flow,facebook/flow,chenglou/flow,nmote/flow,mroch/flow,nmote/flow,fletcherw/flow,mroch/flow,ForbesLindesay/flow,JonathanUsername/flow,gabro/flow,jeffmo/flow,jeffmo/flow,TiddoLangerak/flow,gabelevi/flow,AprilArcus/flow,jdelStrother/flow,ForbesLindesay/flow,jamesgpearce/flow,mroch/flow,claudiopro/flow,gabro/flow,fletcherw/flow,MichaelDeBoey/flow,jdelStrother/flow,ForbesLindesay/flow,popham/flow,JonathanUsername/flow,jgrund/flow,TiddoLangerak/flow,MichaelDeBoey/flow,ylu1317/flow,samwgoldman/flow,nmote/flow,cesarandreu/flow,popham/flow,jamesgpearce/flow,popham/flow,chenglou/flow,cesarandreu/flow,chenglou/flow,jgrund/flow,JonathanUsername/flow,gabro/flow,JonathanUsername/flow,TiddoLangerak/flow,gabelevi/flow,samwgoldman/flow,popham/flow,popham/flow,ylu1317/flow,nmote/flow,MichaelDeBoey/flow,fletcherw/flow,ForbesLindesay/flow,jeffmo/flow,facebook/flow,jeffmo/flow,jamesgpearce/flow,chenglou/flow,TiddoLangerak/flow,AprilArcus/flow,jeffmo/flow,cesarandreu/flow,jamesgpearce/flow,JonathanUsername/flow,MichaelDeBoey/flow,AprilArcus/flow,gabro/flow,ForbesLindesay/flow,samwgoldman/flow,jdelStrother/flow,mroch/flow,MichaelDeBoey/flow,ForbesLindesay/flow,facebook/flow,AgentME/flow,facebook/flow,JonathanUsername/flow,claudiopro/flow,jgrund/flow,samwgoldman/flow,ylu1317/flow