Fix token issuer logging

There was an issue with token issuer logging in the cf-uaa-lib. This change just bumps versions of the downstream dependencies. This pull request will start passing once the other pull requests are merged and the new versions of those gems are released: 

https://github.com/cloudfoundry/cf-uaa-lib/pull/7
https://github.com/cloudfoundry/cfoundry/pull/27