Recursive includes handling

Added:

• New #ramlfications channel on freenode (web chat link)! Come chat, I’m lonely.
• Documentation for configuration and the update command.

Fixed:

• Handle recursive/cyclical !includes in RAML files for now (PR)
• Encoding issues from upgrading to tox 2.0
• tests/test_utils.py would create ramlfications/data/supported_mime_types.json; now mocked out.