DRY up the provider imports
Add minimal rightscale provider.

This is the minimal amount of functionality to make the following work:

    bang --list some_stack_in_rightscale.yml
Ignore .ropeproject/
Fix some PEP8 whitespace issues
Add ``logging`` to RC_KEYS.

This allows deployers to configure logging in their ~/.bangrc.
Implement server creation and launching for rightscale