Bump src/collector, src/warden

Bump cloudfoundry/collector:
  James Myers and Mike Gehard:
     Fix formatting ( Travis created: https://travis-ci.org/cloudfoundry/collector/builds/43893646 )
     Merge remote-tracking branch origin/pr/18 ( Travis Unknown )
  Etourneau Gwenn:
     Ident && router key function added ( Travis Unknown )
     Adding router.requests.component key ( Travis Unknown )
     Add router request by sec Add http code status for the router itself Add proper key name for the router Add by component request ( Travis Unknown )
Bump cloudfoundry/warden:
  James Myers and Joseph Palermo:
     Use virtualbox for bin/test_in_vm because we no longer publish the fusion box ( Travis started: https://travis-ci.org/cloudfoundry/warden/builds/43893630 )
Bump src/acceptance-tests

Bump :
  David Lee and Zach Robinson:
     use 512M for java apps