Bump src/gorouter/src/github.com/cloudfoundry/gorouter, src/gorouter/src/github.com/nu7hatch/gouuid, src/gorouter/src/github.com/rcrowley/go-metrics

Bump cloudfoundry/gorouter:
  Phan Le:
     Remove TODOs copied from standard library server.go ( Travis Success: https://travis-ci.org/cloudfoundry/gorouter/builds/16167078 )
     Make router tests pass locally ( Travis Success: https://travis-ci.org/cloudfoundry/gorouter/builds/16166927 )
  Eric Malm:
     Remove irrelevant tests against server.go ( Travis Success: https://travis-ci.org/cloudfoundry/gorouter/builds/16167007 )
     Move server_test.go alongside server/server.go ( Travis Unknown )
     Run proxy/server_test.go against built-in net/http ( Travis Unknown )
     Copied net/http/serve_test.go as server_test.go ( Travis Unknown )
     Remove file that was introduced accidentally ( Travis Success: https://travis-ci.org/cloudfoundry/gorouter/builds/16057621 )
  Abhijit Hiremagalur:
     Copy library net/http/httptest/server.go and switch it to our server/server.go ( Travis Unknown )
Bump nu7hatch/gouuid:
  Chris Kowalik:
     Merge pull request #15 from Zariel/speed-up-parse-hex
  Chris Bannister:
     Dont compile the regexp for every ParseHex call.
Bump rcrowley/go-metrics:
  Richard Crowley:
     Merge pull request #30 from rcrowley/librato
  mihasya:
     add missing counter for timers
     change occurrences to operations
     consistent Measurement struct creation
     make timer units configurable in a semi elegant way
     converting everything to map[string]interface{}