Bump converger, docker-circus, garden-linux, inigo, stager

Bump cloudfoundry-incubator/converger:
  Ted Young:
     add metric counters to lrp watcher ( Travis Success: https://travis-ci.org/cloudfoundry-incubator/converger/builds/35171309 )
Bump cloudfoundry-incubator/docker-circus:
  Peter Parente:
     Tailor gets a raw docker image ref, not a docker://
     Bump godeps for DockerStagingResult
     Implementation of Docker tailor w/ metadata fetch
Bump cloudfoundry-incubator/garden-linux:
  Glyn Normington:
     Link to BOSH Release
     Add caveat
     Link to Garden
     Move old README to old/
Bump cloudfoundry-incubator/inigo:
  Peter Parente:
     Stager receives and circus expects raw docker refs
     bump godep for docker runtime-schema
     Check execution_metadata in docker staging test
  Stewart E. Nickolas:
     Docker staging tests
  Steve Powell:
     Make clear where the rootfs lives.
  Glyn Normington:
     update README
Bump cloudfoundry-incubator/stager:
  Stewart E. Nickolas:
     Updated docker_stager cache to use "docker" instead of stack ( Travis Success: https://travis-ci.org/cloudfoundry-incubator/stager/builds/35127195 )
     actually use the dockercircuefilename ( Travis Success: https://travis-ci.org/cloudfoundry-incubator/stager/builds/35066735 )
     wip stager templates ( Travis Success: https://travis-ci.org/cloudfoundry-incubator/stager/builds/35045315 )
  Peter Parente:
     bump godep for docker runtime-schema ( Travis Success: https://travis-ci.org/cloudfoundry-incubator/stager/builds/35008153 )
     Adjust code/tests for new metadata fields post rebase ( Travis Unknown )
     Add docker staging code paths ( Travis Unknown )