Several improvements

 - Added a "stheme" class containing theme-related methods (i.e. html snippets)
 - Fixed RequiredTask (files where not copied as they should)
 - Fixed variables being not unset after generation (creating wrong options in controllers/views generation)
 - Added getActionPrefix($action) and getActionName($action) in SbShell.php, to get an action real name and prefix.
 - Added the "risky" command (Sb.Shell all) in the shell to generate everything (MVC/menus/files/required files)
 - Updated default template : small fixes in actions and views, added a bootstrap file template (<template>/files/bootstrap.php)
 - Updated Sbc lib: views now have options from part AND action, wich are overriden by its options.
 - Updated Sbc lib: small changes
 - Updated some headers.