Added task based service events. Deploy and add floating ip. Requires
celery. Tasks are async, persistent, allow configured retries, countdown, etc.
	modified:   service/__init__.py
	modified:   service/api/__init__.py
	modified:   service/driver.py
	modified:   service/drivers/openstack_driver.py
	modified:   service/mixins/driver.py
	modified:   service/tasks/driver.py

Added example atmo.conf. It's .dist because it needs to be updated for individual deploys.
	new file:   extras/apache/atmo.conf.dist
Merge branch 'master' of github.com:iPlantCollaborativeOpenSource/atmosphere