Version 1.5.1 - lots of autoscale enhancements and other improvements.
Version 1.6.0 - adds support for Cloud Queues (Marconi).
Version 1.6.1 - adds support for Backups for Cloud Databases.
Merge remote-tracking branch 'upstream/master'

Conflicts:
	docs/autoscaling.md
	pyrax/autoscale.py
	pyrax/clouddatabases.py
	pyrax/cloudloadbalancers.py
	pyrax/utils.py
	tests/unit/fakes.py
	tests/unit/test_autoscale.py
	tests/unit/test_cf_container.py
	tests/unit/test_cloud_blockstorage.py
	tests/unit/test_cloud_databases.py
	tests/unit/test_cloud_dns.py
	tests/unit/test_cloud_monitoring.py
	tests/unit/test_manager.py
	tests/unit/test_module.py