SpringAtom-#58

- simplified the navigator construction
 - only one view (tile) definition
 - including specific parts of navigator possible only if currently logged user can access the URI
SpringAtom-#57

- security constraints matching current URIs
SpringAtom-#57

- url-mapping.properties is a simple property file which maps (servlet relative) paths to the tiles view names
 - no more useless methods per view
- SVTilesViewController.java has been changed to allow:
 - reading URI to view name mapping from the Properties
- added SimpleUrlHandlerMapping which points at SVTilesViewController.java as the default view resolved under path /app/* which are the views being further displayed as pages