Converted charm to use Services framework
Fixed typo
Update charm-helpers to fix "ready_file" error
Fixed required explicit container command, and fixed deprecation warning
Fixed peer relation being mandatory
Merge pull request #1 from johnsca/master

Convert to Services framework

This switches to the charmhelpers services framework, a Python framework for easing the development of
charms. This code now follows the standard pattern that the docker container is automatically started with the proper arguments when its relations change. This same pattern can easily be extended for use with other docker containers than the one provided. Orchestration from dockers perspective happens automatically as the Juju topology evolves.