Big update -- Identity Sharing in Atmosphere!

* Preliminary API for Identity and Provider sharing (Restricted to identity
  owners and staff members -- Sharing a shared identity is NOT allowed.. unless
  you are staff)
* AccountProvider.make_superuser will let you easily share the admin accounts
 (REPL ONLY)
* Admin accounts now call admin_list methods to show all instances and volumes
  * This feature REQUIRES the latest update to libcloud 0.14.0-dev
* Small bugfixes in script, openstack account creation
* Added superuser creation to account provider migration script

	modified:   api/group.py
	modified:   api/instance.py
	modified:   api/serializers.py
	modified:   api/volume.py
	modified:   atmosphere/urls.py
	modified:   core/migrations/0018_build_accountprovider.py
	modified:   core/models/identity.py
	modified:   core/models/instance.py
	modified:   core/models/profile.py
	modified:   core/models/provider.py
	modified:   core/models/quota.py
	modified:   core/models/volume.py
	modified:   resources/js/cf2/views/sidebar/sidebar.js
	modified:   scripts/import_users_from_openstack.py
	modified:   service/accounts/openstack.py
Merge branch 'master' of https://github.com/iPlantCollaborativeOpenSource/atmosphere