Controller_Url now accounts for no get vars
fixes 1 get var issue from b5c2aee
View_Date::selector() no longer uses table design
updates common.css for new View_Date::selector() design
removes redundant check in Controller_Url::__construct
adds missing attribute Model_Module::position
adds and implements Model_Dao::_get_columns() and _column_to_var()
adds comments to new Model_Dao functions