Bump src/tools:

David Stevenson and Jesse Zhang (2):
      Use statements instead of an "if" modifier
      Make collector pass through all metrics in VARZ

David Stevenson and Scott Calvert (1):
      Collector uses the latest version of vcap_common

Georg Apitz and Jesse Zhang (5):
      collector sends metrics about service capacity
      [collector] Modernize Gemfile
      [collector] bump rspec to 2.13
      refactor service handler plan score metric tests
      [collector] clean up test for ServiceHandler#send_metric

Mark Rushakoff (2):
      Use old hash syntax in Gemfile
      Slightly more information in collector log

Scott Calvert (5):
      Bump README to trigger travis build
      Add travis.yml
      Iterate on travis.yml
      Why is travis ignoring my before_install commands?
      Name the travis config file right this time