init provision_docker module

[chrismeyersfsu]

Instead of implementing the functionality of provision_docker as a hacky role with a lot of output generated; instead, implement provision_docker as an action module in python. This is nice because we can forward a lot of the params to the underlying docker invocation instead of adding a translation parameter for each feature (i.e. ports, network, etc.)

related to #53

• Conforms to the inventory API (i.e. dummy hosts added to the inventory).
• Supports docker connection plugin only (not yet ssh)

Looking for feedback on this direction/implementation.