Nomination

I'm not really sure what @maxnordlund thinks seems reasonable here, but from reading the link, I would say that it would be ok to put that line there, even though people usually tend to put their bundles in `.bundle`, which is why that is already in Githubs default [ruby](https://github.com/github/gitignore/blob/master/Ruby.gitignore) and [rails](https://github.com/github/gitignore/blob/master/Rails.gitignore) project `.gitignore` templates.

I say keep it.