setting group perms on the virtualenv to www-data, version of
edx-platform
Creates three types of vagrant configs

* vagrant-shortstack
  - lms / studio / forums
* vagrant-shortstack-xml
  - lms / studio / forums (xml primary)
* vagrant-fullstack
  - everything that we think is working
Merge pull request #200 from edx/jarv/vagrant-reorganization

Jarv/vagrant reorganization