Marmalade

Automatically set `bug-reference-url-format' and enable `bug-reference-prog-mode' buffers from Github repositories.

What it do is:

1. If `bug-reference-url-format' is not set and this appears to be part of a git working copy (we can locate a .git/config).

2. Find the git remote repository (run 'git ls-remote --get-url').

3. If the remote matches github.com set `bug-reference-url-format' to the correct Github issue URL (we set it buffer locally).

4. Enable `bug-reference-prog-mode'.