Travis ci

Integrates Travis CI with Edit Flow, this issue:
* https://github.com/Automattic/Edit-Flow/issues/172

Daniel, to get this working:
* Merge this pull first
* Check that my submodule is still a submodule, 'git submodule add git://github.com/scribu/wp-tests-lib.git tests/lib'
* Login/register for Travis then enable Travis for Edit Flow on your profile, https://travis-ci.org/profile