Revert "Merge commit '09db9c9c0daaa2914f14875da3e01b86efd49b3d' as '.vim/bundle/ruby-matchit'"

ruby-matchit plugin worked for % matching for ruby `if` and `end`, but broke %
matching everywhere else. :(

This reverts commit fe2bfff27d42e7554ff86707b20c64149d4909c7, reversing
changes made to 79fe306c6f6cf947b5ff7305612ca031805fa7f5.
Add current vim plugins to README