can now use AuthenticationBackends with permissions.
Merge pull request #573 from garrypolley/master

Allow Django  AuthenticationBackends to work with Django user

Thanks @garrypolley
Merge branch 'master' of github.com:hmarr/mongoengine
Added Garry Polley to contributors list

hmarr/mongoengine#573
Updated URLField

handle unicode and custom validator (MongoEngine/mongoengine#136)
Fix loop
Unicode fix reverted but can have custom validator

MongoEngine/mongoengine#136
Allow updates with match operators (MongoEngine/mongoengine#144)
Unicode fix for repr (MongoEngine/mongoengine#133)
Updated test
Added chaining regression test (MongoEngine/mongoengine#135)
Fixing py3 compat
Version bump
bug fix for RefferenceField.to_mongo when dbref=False
addition to AUTHORS
Updated travis.yml
Trying to fix seesaw test on travis
Adding some debugging
Fixed handling for old style types
Don't freeze the current query state when calling .order_by()

This changes order_by() to eliminate its reference to
self._cursor. This meant that any parameters built by QuerySet
that followed an order_by() clause were ignored.