Bunch of changes inspired by r00k

vim/bundle/vim-rails/CONTRIBUTING.markdown

@@ -0,0 +1,16 @@
+If your [commit message sucks][suck], I'm not going to accept your pull
+request.  I've explained very politely dozens of times that [my general
+guidelines][guidelines] are absolute rules on my own repositories, so I may
+lack the energy to explain it to you yet another time.  And please, if I ask
+you to change something, `git commit --amend` and `git push -f`.
+
+If a feature idea is nontrivial, you should probably open an issue to [discuss
+it][] before attempting a pull request.  One of the biggest challenges in
+maintaining rails.vim has been beating back the bloat, so do not assume that
+your idea will make the cut.  And if I like your idea, I'm generally amenable
+to just knocking it out myself, rather than making you familiarize yourself
+with a 4 thousand line code base.
+
+[suck]: http://stopwritingramblingcommitmessages.com/
+[guidelines]: http://tbaggery.com/2008/04/19/a-note-about-git-commit-messages.html
+[discuss it]: http://www.igvita.com/2011/12/19/dont-push-your-pull-requests/