Vendor all the source at a working version with godep.
Add missing Godeps.json file.

You can duplicate the build error with
the following command:

  go build

However, using the godep binary, you can
force it to use the known good versions
of the library that are saved in the
Godeps/_workspace directory.

  godep go build
Travis CI should use godep
Merge pull request #6 from PeopleAdmin/use_godep_for_dependencies_with_vendored_source

Use godep for dependencies with vendored source