support creation of a datajam specific devstack image

Including:

* LMS
* CMS
* Forums
* Insights
addressed review comments
revert branch pointers to master
Merge pull request #467 from mulby/gabe/devstack-insights

support creation of a datajam specific devstack image
use correct branches for the datajam
Merge pull request #477 from mulby/gabe/datajam/use-correct-branches

use correct branches for the datajam
create a release datajam package
Merge pull request #480 from mulby/gabe/datajam/freeze

create release datajam package
fix path issue in release vagrantfile
Remove loghandlersplus dependency from insights.
Merge pull request #481 from edx/brian/remove-loghandlersplus

Remove loghandlersplus dependency from insights.
Change insights script to use datajam example app (instead of mongolog).
Merge pull request #492 from edx/brian/use-datajam-insight-app

Brian/use datajam insight app
datajam: add halt and start actions to the utility script
datajam: support non-ubuntu virtualenvwrapper, check dependencies
Merge pull request #493 from mulby/gabe/datajam/refactor-bootstrap-script

datajam: add halt and start actions to the utility script
datajam: be less aggressive during destroy
Merge pull request #500 from mulby/gabe/datajam/dont-remove-files

datajam: be less aggressive during destroy
datajam: document usage
Merge pull request #499 from mulby/gabe/datajam/doc

datajam: document usage