bug fix for RefferenceField.to_mongo when dbref=False
addition to AUTHORS
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.
session collection parameter; encoding optional

Added a parameter for the name of the session collection; Added the
option to not encode session_data, which is useful for expiring sessions
of users when a password is changed, etc.; these upgrades provided by
SocialVilla Inc.
split line to meet 79 char max line limit
added comments
EmailField should honor StringField validation as well
First as_pymongo implementation
Update AUTHORS

added me (Adrian Scott, issues 180, 181)
Implement _get_as_pymongo
Add as_pymongo to __getitem__ and in_bulk
Add more tests
Updated Changelog
Merge branch 'master' of https://github.com/shaunduncan/mongoengine
Fixed EmailField so can add extra validation

(MongoEngine/mongoengine#173, MongoEngine/mongoengine#174, MongoEngine/mongoengine#187)
Merge branch 'master' of https://github.com/AdrianScott/mongoengine
Updated Changelog
Merge branch 'order-by-chaining' of https://github.com/pteichman/mongoengine
Update AUTHORS & Changelog (MongoEngine/mongoengine#176)
Fix sequence fields in embedded documents (MongoEngine/mongoengine#166)