Make users more aware of features using gamification

[dlangenk]

We noticed that even some seasoned Biigle users don't know about some features. Newsletters/user meetings/conferences are good way to make people aware of NEW features, but most people will not benefit because they are new to Biigle or do not receive/read the newsletter ....

The idea is to have badges for the most important features, e.g. "You're a wizard Harry" (Awarded for using Magic SAM for the first time). This way people can have a look at the badges they haven't received yet and thus see what features they are missing out on.

[mzur]

References #152 and #153