Moose now warns when you try to load it from the main package. Added a

Moose now warns when you try to load it from the main package. Added a
test for this (which requires Test::Output to run).

The tests had many "use_ok('Moose')" lines that started warning. The
use_ok tests weren't really testing anything, since the tests need the
modules they were trying to load in order to run. You actually get a
better error message by just using the module normally (if said module
fails to compile).