retab.
Add "running tests and lint" section.
Add a section on how to generate thrift definition files.
Update travis config to use services section.
Revert "Update travis config to use services section."

This reverts commit f1f34060201cbb454bc596033d67f3aed956ab21.
Temporary hack for travis ci issue with cassandra not starting

https://github.com/travis-ci/travis-ci/issues/1053
Merge pull request #69 from racker/update_readme

Update readme