Add .travis.yml
Add .travis.yml

https://github.com/google/web-starter-kit/commit/42350b1839b7b64701fea94a85059727dfd9100c

StartPolymer/polymer-static-app,osr-megha/polymer-starter-kit,StartPolymer/polymer-static-app,StartPolymer/polymer-starter-kit-old,osr-megha/polymer-starter-kit,StartPolymer/polymer-starter-kit-old