Proposal: Use GitHub Pages to store docs

**REVIEW ONLY**

Unfortunately, rdoc.info does not support TomDoc. This is a proposal to use GitHub Pages instead.

The idea here is that we will run `rake docs` with a new release. That task will:

1. Generate the docs
2. Copy them to a temporary directory
3. Checkout the `gh-pages` branch
4. Copy the docs from the temporary directory
5. Notify the user to review/commit changes

Once we push the changes to GitHub, they'll be available at http://site5.github.io/squall. We could also setup a custom domain, like gh.eng5.com/squall.

Thoughts?