Casbah 2.6.5 release

Changes in Version 2.6.5
------------------------
- Updated Mongo Java Driver to 2.11.4
Merge tag '2.6.5' into master

Conflicts:
	project/CasbahBuild.scala
	src/sphinx/changelog.rst
	src/sphinx/conf.py
Update Aggregation to the latest from Java 2.12.0-SNAPSHOT