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Refactor item region processing and loading

This refactoring allows subclasses to add region binding fields without having to rewrite all the loading and processing code.
make checkRegion() protected
Merge pull request #2 from isaacgrant/check-region-protected

make checkRegion() protected
__toString must be public as of 5.3
refactor for easier subclassing of the item group dependency list
Merge pull request #3 from isaacgrant/to-string-fixes

__toString must be public as of 5.3
Merge pull request #4 from isaacgrant/item-group-delete-deps-for-subclasses

refactor for easier subclassing of the item group dependency list
Merge pull request #1 from isaacgrant/item-edit-region-binding-refactoring

Refactor item region processing and loading
prepare for release of 2.0.3