Added support for user-defined images by creating ProviderMachineMembership and two scripts to help convert MachineRequest.access_list, and existing OpenStack image memberships, into ProviderMachineMemberships
Merge branch 'gunnr' of https://github.com/iPlantCollaborativeOpenSource/atmosphere into user_defined_image_lists
Removed private/membership test for now..
Merge branch 'gunnr' of https://github.com/iPlantCollaborativeOpenSource/atmosphere into user_defined_image_lists
Consolidated generate_ and import_machine_membership, user_defined images feature completed.
Migration changes, make MachineRequest.status a TextField()
Added some of the more useful methods from import_machine_membership to MachineRequest model/class..
Cleaned up machine request and processing, verified working
Merge branch 'user_defined_image_lists' into gunnr