python 3.3 test fixes
Merge branch 'master' into 0.8

Conflicts:
	tests/test_document.py
Fixing py3.3 tests
Fixing PY3.3 test cases
Merge branch 'master' into 0.8

Conflicts:
	mongoengine/queryset.py
	tests/queryset/queryset.py
	tests/test_document.py