Adding comments to config.sh.
Renamed a few config.sh variables to be more intuitive.

add_mirror.sh has better user output.  Updated to reflect
new config.sh.

git-mirrors.sh now outputs proper error codes.

create_gitlab_project.py updated to reflect new config.sh

Now git-mirrors.sh can be added to a cron job
to update all mirrors listed in gitlab.

add_mirror.sh script will now add a git mirror to gitlab!

update_mirror.sh will now update mirrors that have been
added to gitlab!

* It doesn't function as intended yet.
* Depends on create_gitlab_project.py.
* Updated the readme for some prereqs.
* The python script currently only lists an existing
project.  Returns http clone URL.