No longer using the middleman-gh-pages gem
We don't want to track the build directory

Remove files that were stored there previously.
Ignore the right things
Improve deployment toolchain

Add emberjs.com style deployment tasks from the ember.js website
project. Basic style is as follows:

* Work is performed on the `website` repo
* Middleman functions as normal
* Build directory is ignored
* Two new rake tasks are added: `build` and `deploy`
* `rake build` just runs the middleman build but provides a way for us
  to hook in custom tasks that need to be run during build.
* `rake deploy` does the following:
  - Asks for a deployment message
  - Creates or uses the build directory
  - Initializes the local repo if needed and points the remote to the
    `probablywrong/probablywrong.github.io` repo.
  - Updates to origin/master
  - Removes all the files
  - Builds the site
  - Adds all the files with the previously entered commit message
  - Pushes to the site repo
* This workflow has been enhanced to allow for a RESET env var to
  signify that the local repository should be completely deleted,
  refreshed from origin/master, and force pushed to the site repo.
Merge pull request #2 from probablywrong/new-deploy

New deploy