* enhance the app development experience - you can look up the
method introduction right inside the code without searching
via git blame
* easier to write apps for multiple versions
* Original avatarcontroller migrated to the appframework
* Added DataDisplayResponse that show data inline in the browser (used
to retrun the image)
* Removed some unneeded code
* Added unit tests for the avatarcontroller
Lukas Reschke
Morris Jobke
Roeland Jago Douma