Changing "out_of" to a float resulted in some unit and functional test failures related to grade entry items. The problem was that there was an "only_integer" check being done in grade_entry_item.rb.

I also migrated grade_entry_item_test.rb to Machinist.

All of the unit tests and functional tests now pass:

Units:
465 tests, 760 assertions, 0 failures, 0 errors

Functionals:
1131 tests, 1687 assertions, 0 failures, 0 errors