* Introduced modes
* Added modes for preregistration and registration
* Added bootstrap-arrows
* New responsive design for registration mode landing page
* users can now switch from preregistered to registerd
added BMBF Logo
updated er-diagram
Do online Courses
Submenu in admin menu
Stuff
Refactoring Test to VorkursTest

Changed the class-name of Test to VorkursTest in order to prevent hassle with predefined Test in Rails

Signed-off-by: René Meye <rene@meye.md>
Added Support for in Place editing

Signed-off-by: René Meye <rene@meye.md>
Uses In-Place editing on main page

Signed-off-by: René Meye <rene@meye.md>
for local development

Signed-off-by: René Meye <rene@meye.md>