tracking: Moved tracking list into template macro
tracking: Show an additional list for the friends of the current user
tracking: Include the current user in the "Friends" list
tracking: Adjusted styling
Merge pull request #115 from Turbo87/friend-tracking

Tracking: Show friends in additional list on top
Use mock lib to patch db.session.commit

Otherwise, original function will not be restored if any of assertion
fail.
Separate cleaning and bootstrapping test db.

This will allow generic model tests to pass (they expect totally empty
database)