Added parent caching to cache_tree_children filter (test included)
Removed QuerySet dependency from updated cache_tree_children
Minor optimization
Merge pull request #226 from orokusaki/master

Updated `cache_tree_children` to include parent caching. thanks @orokusaki
add failing test case for #232
Merge branch 'master' of github.com:django-mptt/django-mptt

Conflicts:
	tests/myapp/tests.py
Fix tests on django 1.2
Fix tests on django 1.2
make all the tracking methods classproperties / classmethods on MPTTModel. fixes #232
Provide a section in the documentation that warns mptt users about the concurrency issues and about the fact that it's their responsibility for ensuring mutual exclusivity.

* this fixes issue #236
* also add a new link to an mptt tutorial (I find this more usefull than the existing ones as it also points out that CRUD operations need to be guarded by locking statements)
Merge pull request #242 from kux/issue_236

Documentation fix for issue #236
Merge pull request #2 from django-mptt/master

latest from upstream