Magneto can now send HTML messages.

- I also delete one-to-one messageing because its not supported
  properly by Xmmp nor by HipChat API itself.
- Because the API changed, I updated the version to 0.3.0.
- The annotations now have descriptions and example parameters as well,
  for better help documentation.
HTML can be send without the special object
Merge pull request #15 from Magnetme/send-html

Magneto can now send HTML messages.