Implemented gitolite replacement

I have created a simple shell replacement to get rid of the gitolite dependency. I use it in my own setup and it should do everything dokuen would need. It has no access restrictions though.

I was working on also implementing access restrictions until it occurred to me that since all applications run as the same user and they can execute arbitrary code it is trivial to make an evil app that changes anything related to dokuen. So until apps run either in chrooted jails or with a user each access restrictions don't make much sense.