Add services life cycle specs [postgresql & mongodb]

This PR adds life cycle specs for quickly verifying the working of high-level v1 service functionality.
In the current implementation you will need a bosh-lite with a running cloud foundry.
You can then deploy the services with `./templates/make_manifest warden && bosh deploy`.
Service auth tokens can be installed by running `bundle install && rake setup`.
Now you can run the specs `rspec spec`.

The life cycle specs are inspired by [cf-runtimetest](https://github.com/cloudfoundry-community/vcap-ruby/tree/master/cfruntime-tests).