Cache object having parent
Cache ancestors
Getting content is real heavy, cache it
Another content object cache
Cache children of the tree
Filtering published pages in cache too
Mangle the key a bit more
Return value fix
Revert "Getting content is real heavy, cache it"

This reverts commit 77590ce659edca4538e671f1618d9bf3a9c7a9db.
Sanitize caching around get_children()
Thanks Batiste for the creds!
Invalidate parent, when dragging page items in the tree
Page must be invalidated on status change
Instead of queryset cache, do it clearer in model
Invalidate pages when moved
Revert "Another content object cache"

This reverts commit 890e9470fe4fedc058348364f0ed68de7f4bc5f1.

To see how it goes with unit test
Clear django cache on setup
Remove duplicate invalidate() calls
Fix warnings about memcache, spaces
Merge branch 'further_caching', a branch that reduce drasticaly the amount of database queries once the cache is warm. Thanks to Markus Törnqvist.