V1 support for service plan descriptions

Bump vcap-common:

$ git shortlog fd6b6d91..068122236
Dr Nic Williams (1):
      VCAP::Component.register returns its configuration

Harshawardhan Gadgil (3):
      Add (optional) user guid and space guid to gateway provision request
      Add (optional) provider to GatewayProvisionRequest
      Add (optional) org-guid to Gateway provision request

Jesse Zhang (3):
      Move rspec from Gemfile to gemspec
      Add tests for SDSClient
      Only use em-http-request on reactor_thread

Nicholas Kushmerick (1):
      Add optional plan_descriptions to a V1 service offering

Pieter Noordhuis (3):
      Relax yajl-ruby dependency
      Make varz thread-aware
      Bump patch version