Implemented basic user "modul"

Added a new view to list, create, read, update and delete (not implemented).
Added routes configuration, as well as a form configuration. Added link to the
user list in the main menu.
Working on the userlisting. Temporary commit.
New styles for the edit and read pages.
Make loaded item available in the template
Added context menu to the header
Tryint to make url generation more flexible
Overwrite __unicode__ function for items.
Implemented basic delete dialog.