Merge branch 'master' into pr/539

Conflicts:
	mongoengine/base/datastructures.py

docs/changelog.rst

@@ -2,6 +2,39 @@
 Changelog
 =========
 
+
+Changes in 0.9.X - DEV
+======================
+
+- Fixed change tracking on nested MapFields #539
+- Dynamic fields in embedded documents now visible to queryset.only() / qs.exclude() #425 #507
+- Add authentication_source option to register_connection #178 #464 #573 #580 #590
+- Implemented equality between Documents and DBRefs #597
+- Fixed ReferenceField inside nested ListFields dereferencing problem #368
+- Added the ability to reload specific document fields #100
+- Added db_alias support and fixes for custom map/reduce output #586
+- post_save signal now has access to delta information about field changes #594 #589
+- Don't query with $orderby for qs.get() #600
+- Fix id shard key save issue #636
+- Fixes issue with recursive embedded document errors #557
+- Fix clear_changed_fields() clearing unsaved documents bug #602
+- Removing support for Django 1.4.x, pymongo 2.5.x, pymongo 2.6.x.
+- Removing support for Python < 2.6.6
+- Fixed $maxDistance location for geoJSON $near queries with MongoDB 2.6+ #664
+- QuerySet.modify() method to provide find_and_modify() like behaviour #677
+- Added support for the using() method on a queryset #676
+- PYPY support #673
+- Connection pooling #674
+- Avoid to open all documents from cursors in an if stmt #655
+- Ability to clear the ordering #657
+- Raise NotUniqueError in Document.update() on pymongo.errors.DuplicateKeyError #626
+- Slots - memory improvements #625
+- Fixed incorrectly split a query key when it ends with "_" #619
+- Geo docs updates #613
+- Workaround a dateutil bug #608
+- Conditional save for atomic-style operations #511
+- Allow dynamic dictionary-style field access #559
+
 Changes in 0.8.7
 ================
 - Calling reload on deleted / nonexistant documents raises DoesNotExist (#538)