link to github in org-mode

org-github-links.el

This is pretty much my first non-trivial elisp stuff; it lets you create links in org-mode to github repos, commits and issues, pretty much the same as Github Flavored Markdown allows:

github:user/repo
github:user/repo@sha
github:user/repo#issue

Being not that great with elisp (mostly just knowledge of what functions are available, etc), Iā€™d love critique and comment on this. Thanks!