RED: essex template includes correct swift3 egg.
GREEN: essex template includes correct swift3 egg.
RED: os_release is no longer used in proxy config templates.
GREEN: os_release is no longer used in proxy config templates.
Add instructions for running basic tests, update readme so examples don't require mounting devices.
[Michael Nelson] Fixup templates for essex release, add template unit tests for changes
[James Page] Add standard unit test fixtures for openstack charms