see issue #63
- Support for joined-table inheritance
see issue #64
- Added similar django_mptt methods get_siblings and get_children
see PR #61
- Allow to specify ordering of path_to_root
see issue #57
- Fix rebuild tree
- Added support node's identifier start from 0
see issue #56
- Added custom default root level. Support Django style level=0
see PR #51
- fix of index columns names
see PR #50
- Changed
parent_id
to dynamically match the type of the primary_key - exposed drilldown_tree's logic and path_to_root's logic as both instance and class level method