timesheets

Thanks to autotest-mac, I don't need all that custom AutoTest Growl stuff anymore

removal of embedded models now properly implemented

Stubbed current_user for controller in ProjectsController specs so that there's no need to invoke Authlogic and touch the database

fixed Timesheets validation for overcharged days: invalid entries are no longer counted against the sum. Based on MDLogix session, User now has #hours_on which reports hours that the user has logged against a given project

basic specs to check if default_scope is set for both Timesheets and TimeEntries