support $vimruntimepath/bundle

I'd like to use it like a vim "bundle" using pathogen, but I am not able to easily find out what would have to be added, to would make installation work like this:

• Install some vim plugin manager supporting a directory bundle in $vimruntimepath (e.g. ~/.vim/bundle/). Pathogen is just one of those.
• cd ~/.vim/bundle
• git clone https://github.com/Glench/Vim-Jinja2-Syntax.git

and all is done.

Who might help out?

:enhancement