cleaning up vagrant dirs
changing discern branch from dev to master
updating readme and vagrant files
Merge remote-tracking branch 'origin/master' into jarv/vagrant-releases

Conflicts:
	vagrant/devstack/README.rst
adding release dir
adding fullstack readme and updating devstack Vagrantfile
renaming {edxapp,forum}_skip_supervisor to devstack
adding env var for base dir to vagrantfile
Merge pull request #442 from edx/jarv/vagrant-releases

Jarv/vagrant releases