Bump src/vcap-common

Bump cloudfoundry/vcap-common:
  Aram Price:
     Cleanup .travis.yml ( Travis Success: https://travis-ci.org/cloudfoundry/vcap-common/builds/14878686 )
     Fix some of the rspec deprecation warnings ( Travis finished: https://travis-ci.org/cloudfoundry/vcap-common/builds/14521940 )
     Upgrade ruby to 1.9.3-p484 ( Travis Unknown )