install etcd and friends properly

Signed-off-by: Phan Le <ple@pivotallabs.com>
Bump src/executor, src/garden, src/inigo, src/stager

Bump cloudfoundry-incubator/executor:
  Ted Young:
     upload and download report byte size ( Travis Unknown )
     Log to loggregator when uploading fails ( Travis Unknown )
     Log to loggregator when downloading fails ( Travis Unknown )
     bump godeps ( Travis Unknown )
     Add err message to loggregator when a script has out of mem error. ( Travis Unknown )
     moved tests around ( Travis Success: https://travis-ci.org/cloudfoundry-incubator/executor/builds/21983403 )
     Emit loggregator messages when uploading and downloading ( Travis Unknown )
     bump godeps ( Travis Unknown )
  Alex Suraci:
     if not given a streamer, don't try to stream ( Travis Unknown )
     Fix main by instantiating the compressor. ( Travis Unknown )
     add Try action handling ( Travis Unknown )
     bump deps ( Travis Unknown )
     clean up after ourselves ( Travis Unknown )
     bump deps ( Travis Success: https://travis-ci.org/cloudfoundry-incubator/executor/builds/21979383 )
     upload step can now compress into .tar.gz ( Travis Failed: https://travis-ci.org/cloudfoundry-incubator/executor/builds/21977761 )
     fix race when stopping handling run onces ( Travis Success: https://travis-ci.org/cloudfoundry-incubator/executor/builds/21691534 )
  David Varvel:
     add compressor; compresses to .tar.gz ( Travis Unknown )
     Backfill test when downloading with extract flag set to true. ( Travis Success: https://travis-ci.org/cloudfoundry-incubator/executor/builds/21715033 )
Bump pivotal-cf-experimental/garden:
  Alex Suraci:
     fix integration tests ( Travis Unknown )
     bump deps ( Travis Unknown )
Bump cloudfoundry-incubator/inigo:
  Alex Suraci:
     include build artifacts cache upload/download uris
     set up garden once, in suite setup
Bump cloudfoundry-incubator/stager:
  Alex Suraci:
     stager passes build artifacts cache uris along ( Travis Unknown )
     bump deps ( Travis Unknown )
  Ted Young:
     Add drone badge ( Travis Unknown )
     Use correct name when downloading app package ( Travis finished: https://travis-ci.org/cloudfoundry-incubator/stager/builds/21982377 )
     added names to staging actions ( Travis finished: https://travis-ci.org/cloudfoundry-incubator/stager/builds/21962729 )
     bump godeps ( Travis Unknown )