Added default user subnet creation.
Added hashing and collision detection for subnets.
Added core.ldap.get_uid_number method.
Added get_status method to instance. Moved it out of core.models.instance.
Removed some extraneous comments.
Changed router creation so users are admins of their own subnet. [Edwin Review]
Reworked the celery workflow a little. It still needs works.
	new file:   core/ldap.py
	modified:   core/models/instance.py
	modified:   core/models/machine.py
	modified:   core/models/profile.py
	modified:   scripts/import_users.py
	modified:   service/api/instance.py
	modified:   service/driver.py
	modified:   service/drivers/openstackNetworkManager.py
	modified:   service/drivers/openstack_driver.py
	modified:   service/instance.py
	modified:   service/mixins/driver.py
	modified:   service/tasks/driver.py
Merge branch 'master' of github.com:iPlantCollaborativeOpenSource/atmosphere

Conflicts:
	service/mixins/driver.py