Bump src/collector
Add support for using graphite in the collector job
Bump cloudfoundry/collector:
  Simon Johansson:
     Add the graphite historian. ( Travis Success: https://travis-ci.org/cloudfoundry/collector/builds/21188536 )
  Dakota Bailey:
     Better debug msg, fixed copy-paste error in spec ( Travis Success: https://travis-ci.org/cloudfoundry/collector/builds/20612902 )

Signed-off-by: John Tuley <jtuley@pivotallabs.com>