add travis config
add travis config

rcorp/vulcanize,threeday0905/vulcanize,rcorp/vulcanize,Polymer/tools,Polymer/polymer-bundler,bendroid/vulcanize,Polymer/polymer-bundler,Polymer/polymer-bundler,threeday0905/vulcanize,Polymer/tools,Polymer/tools,Polymer/tools,bendroid/vulcanize