Add requirements for django/lettuce integration

* Install development version of lettuce patched for django 1.5.5+
* Add git to requirements
Move test preparation code to terrain file
Use lettuce function to determine tsune root
Move lettuce tests for cardbox to cardbox app
Load fixtures to test database
Implement step to check for user in database
Add lettuce again to installed apps and fix dbsync
Split ci settings in lettuce and ci
Add database management to terrain.py
Put the page name to url mapping into the terrain.py
Reorder steps to match order in feature files
Implement lettuce test for UC1
Check user authentication by user name
Add UC number to feature files
Implement check if user is authenticated
Rework layout of prototype