Update for using recent version of pyapi-gitlab

Fixes issue #2
Merge branch 'release' into development for fixing move bug
Merge branch 'release' v0.2.10 into development
Upgrade the old python-gitlab to new pyapi-gitlab

Some modifications were in order so that gitlab-mirrors
works with the latest pyapi-gitlab.
Merge branch 'upgrade-pyapi-gitlab' into development
New version 0.3.0pre
Updating changelog
Merge branch 'update-docs' into development
update RELEASE
update version
Adding upgrade docs
Removing old update docs
updating CHANGELOG
Merge branch 'development' release v0.3.0