Refactored model

Added model modul and put the user modul in it. Change various paths to the
new package layout.
Moved code to initialize the user model

The code to initialize the user model is not located in the user modul.
Added tests on the usermodel
Just import sqlalchemy and not submodules.
Added get_roles method

Added get roles method to the user object to collect all roles the user has.
Added testcases.
Added location for mako templates
Removed old static files
Added bootstrap to static
Added custom css
Added first basic templates
Added login and logout view
Added formbar to render to login form.