Add travis-ci config file

Change-Id: I152e0f3e4809e26f35a9956cbf86edc28e7882de
Merge pull request #89 from ryanpetrello/master

Make the metadata service port configurable.
Merge pull request #88 from dreamhost/feature/turn-on-travis-ci

Add travis-ci config file
Pass the tenant ID through to the Nova metadata proxy.