Add wp-dev-lib w/ Travis CI

@kienstra you can turn on Travis for your repo by authorizing Travis CI to connect to your GitHub account at https://travis-ci.org/profile/kienstra

Then slide on the toggle for the adapter repo listed there:

![pasted_image_10_31_14__1_09_pm](https://cloud.githubusercontent.com/assets/134745/4867877/d20da02c-6139-11e4-8dbf-da902f21a568.png)