Updates metadata.rb to match format of sprout-foobar [#69592896]
Adds ci rake task for travis to run [#69592896]

Once travis has support for Mavericks the travis.yml file should run the ci task
Backfills specs for add_launch_agent recipe [#69556800]

- Adds dependency on sprout-osx-base cookbook to use its home folder rather
  than relying on the user running chef as it can not be the correct user
Backfills specs for add_launch_agent recipe [#69556800]
Backfills specs for create_postgres_user recipe [finishes #69556800]

- Tweaks install_postgres recipe spec to better use lets and befores