Add admin builder.
Support dev and pre releases as release branches, when merging forward.
typo
Merge pull request #31 from ClusterHQ/admin-builder

Add admin builder.
Move admin builder to dedicated slave.
Merge pull request #30 from ClusterHQ/vagrant-tests

Build vagrant images on buildbot.
Reuse the installDependencies from flocker_bb.builders.flocker in flocker_vagrant.
Run acceptance tests.