[Catalyst] Cat Model DBIC Schema fails test if *optional* prereq isn't installed

[Toby Corkindale]

Hi,
Catalyst::Model::DBIC::Schema lists Catalyst::Devel as an *optional* 
dependency.

However if you do not have Catalyst::Helper installed (via 
Catalyst::Devel) then C-M-DBIC-Schema fails its unit tests and won't 
install via CPAN.

-Toby