Group management script

This a simple script to list/add/remove/enabe/disable groups, instead of having to deal with the database directly.

All actions (excepted add) support the wildcard character *. It should be intuitive enough to use.
Fix for empty rage_show['akas']['aka']

For some reason tvrage returns an empty rage_show['akas']['aka'], which make the script fail. The failed show is then retried over and over since nothing is stored in the database. This adds the lissing check to avoid the issue.
Merge pull request #43 from guillp/master

Fix for empty rage_show['akas']['aka']
Merge pull request #42 from guillp/patch-1

Group management script
Merge branch 'master' into development