Migrating from Vundle to NeoBundle

Hey Guys,
After reading about NeoBundle, I was convinced to give it a try, it does everything that Vundle do but with lots of extra stuff (you can read the comprehensive [documentation](https://github.com/Shougo/neobundle.vim/blob/master/doc/neobundle.txt)). But for me, the two killer features were: revision locking for the Bundles and Dependecy specification.

I testes everything on my machine and everything is running like it was before. I created a rake task for migrating from vundle (which consists of merely deleting existing `vim/bundle/*` so NeoBundle can refetch them again by itself (I found that to be a necessary step).

Please give it a try before merging and let me know if this could be improved somehow.

Thanks