[logos] Add support for generators of the format 'name@/perl/lib/path' - prepend the path to INC before we try to load the generator module.

From: Dustin L. Howett <dustin@howett.net>

git-svn-id: http://svn.howett.net/svn/theos/trunk@603 4410221e-0ddf-4ce3-99c0-2db6c0dbc727
Merge remote-tracking branch 'upstream/master'