Trait double doesn't need a trait suffix

[andizer]

When a double has been made for a trait the CS expects to have it suffixed with -trait. This can lead to weird file naming with a lot of traits in it.

When it is a double or is in the doubles directory we should just append -double to it.

[jrfnl]

Solution: change the Double/Mock to a class which uses the trait. Problem solved.