Django-actrack

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- add 'get_del_item' function to enable logging during deletion
- add 'DeletedItems.registry.remove' to enable cleanup of DeletedItems

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- fix combine_with using targets inclusion rather than equality
- add 'inherit' option for group method

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- fix db selection via 'using' keyword
- combine_with_* methods now require the kwargs from the 2 actions

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- add grouping customization via action handler methods

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- grouping only occurs at save time

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- use of a buffer to combine actions according to user-defined rules
- use of a deleted items buffer