use_ok without imports

[Todd Rinaldo]

I've got a unit test that parses for all my modules in a LARGE project
and does a use_ok($module) on them. The problem is that some of the
modules (legacy) export the same methods.

As it stands, I don't see that there's a way to block imports via use_ok.

I suggest making it so that use_ok($module, undef) does this.

I've opened a ticket with a patch to make this happen on github:
http://github.com/schwern/test-more/issues#issue/41