API calls to timesheets_deleted are broken

[picklecolor2]

I was unable to get the timesheets_deleted API calls to work. The error message led me to looking at line 11 in results.py:

11 self.name = class_to_endpoint(self.model.__name__) + ('' if is_singleton else 's')

Which returns timesheet_deleteds for this class. I've submitted a pull request, #11.