Add top-level gradle build file that just redirects to our existing build system.  This addresses part of Issue #316, enough to get working with Travis.  Also add a .travis.yml file that should get us building there.
add assemble build target, used by travis
Merge pull request #330 from twosigma/travis

Travis
Update README.md
add a bug to test travis
Merge pull request #331 from twosigma/travis

add a bug to test travis
removing bug -- test complete
Merge pull request #332 from twosigma/travis

removing bug -- test complete
Update README.md

clarify how to install chromedriver
Merge remote-tracking branch 'origin/master' into alee/update-child-scope