Fixed annoying Vundle untracked changes

It should be fixed in Vundle itself. It now sets the default path to
bundle/vundle somehow, so the spell files are saved there. By allowing a
dirty submodule it won't bother me when committing my dotfiles, but I
will be losing my spell custom dicts :(

A better fix would be to set the spellfile manually in my vimrc.

.gitmodules

@@ -1,6 +1,7 @@
 [submodule "vim/bundle/vundle"]
 	path = vim/bundle/vundle
 	url = git@github.com:gmarik/vundle.git
+    ignore = dirty
 [submodule "oh-my-zsh"]
 	path = oh-my-zsh
 	url = git@github.com:balkian/oh-my-zsh.git