run tests against django 1.6.x branch. stop running them against django master on python 2.6
fix usage of python_2_unicode_compatible decorator
fix get_query_set deprecationwarnings in django master
remove dodgy commit_unless_managed from _move_node, how the heck did that get there?
also use transaction.atomic() in docstrings for things.
fix deprecation warning in tests
fix output on doctest failure