Changes since 1.00:
- Added 'get_my_factory()' and 'get_my_factory_type()'
- Ensure that new() returns undef if get_factory_class() doesn't
work properly and factory_error() is overridden (and the
overridden method doesn't die)
- Added a few more tests to ensure factory_log() and
factory_error() working properly
- add_factory_type() checks %INC to see if a class is already
loaded.
- All log/error messages now have variables in apostrophes
rather than brackes.
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