Super-simple bug tracker integration

[scallopedllama]

I think it would be very useful if commit messages are parsed looking for strings that look like issue number (like #12345) that get automatically changed to a link to the corresponding bug in an external bug tracker (configurable in the config file). Kallithea supports this and it works very nicely.

This would simply make anything that looks like an issue number in a commit a hyperlink to your bug tracker.