Apply the capital_H_dangit rendering helper method to the post title and body.
Add #capital_H_dangit to Helpers::Rendering

Capitalize any occurrence of /github/i to "GitHub" unless it's a URL.

First regexp: http://rubular.com/r/iFrOhpIJ6v
Second regexp: http://rubular.com/r/tF3FN8lXOA
Merge pull request #123 from parkr/patch-1

capital_H_dangit