Add a first hack at a man page for `feature`.

Written in the ronn-format(7), because writing roff(7) directly is a
pain.
Add feature-list.
Add feature-start man page.
Add feature-switch(1) man page.
Add feature-finish(1) man page.
Add feature-merge(1) man page.
Add feature-status(1) man page.
Add feature-stashes(1) man page.
Add feature-clean(1) man page.
Add feature-github-test(1) man page.
Add hotfix man pages.
Add Rakefile for generating and publishing man pages.

I stole this from ronn itself, which fortunately is under the exact same
license.
Add man-page mapping.
Add generated man pages.
Add redirect index page.
Clear out all files in gh-pages branch when building.
Merge man-pages (#41) into master

Add man pages.

Most of these are fairly simplistic, but it's a starting point.

In addition to the generated roff pages (suitable for `man` viewing),
there is a Rake task that will create and publish nice HTML versions:

   http://ifixit.github.com/git-scripts/

I was going to make a task that would copy the man pages in to the
appropriate section on the system, but it seems converting this
repository into a gem and letting rubygems handle that would be better.

Closes #15.