sign_in, sign_up moved from navigation_helpers module
logged as admin added
admins, not_admins scope added
dashboard extracted to DashboardController
adds params for timesheet, activity, time_entry
dashboard routes added
dashboard links added
dashboard party moved to separate views
dashboard implemented to assign/remove admins, see timesheets
users and admins list spec added
check for empty params added
reorganization of features:dashboard and home page