GitLab

So we can reference other projects when mapping.  Also includes logic
to retry when we can't map, so we work through all the items and them
come back through and attempt.

This is a development flag that will delete the project and then restart
everything, only adding that project and its issues/merge requests back
in.

Put default project in the default group, and only create branches if
they don't exist.

As well as a little more validation on some things

Includes:
* Caching everything to make runs faster
* Adding repositoriy overrides for specific configuration
* Adding ids to merge requests
* Changing the git location to be local path again
* Small cleanup to not use multiple-value-list

Removing project specific script, as well as small documentation
additions.

This makes it a little easier to work with non local gitlab instances,
and allows us to not use the "import_url" part of the project api.

Also includes a small change to the output of the gitlab validation,
allowing for more reporting.