Preparation for gofer 2.0 in f21+
Merge pull request #1381 from jortel/gofer-lt-2.0

Preparation for gofer 2.0 in f21 and beyond.
Merge branch '2.4-release' into 2.4-testing
Merge branch '2.4-testing' into 2.4-dev
Add release notes for 2.4.4.
Performing a mongo $set: {} will fail on mongo 2.6+: https://jira.mongodb.org/browse/SERVER-12266

For now fix this only for the failing test case as it should not be an issue in the field for other
locations.  Long term this should be fixed by the move to mongoengine.
Merge branch '2.4-testing' into 2.5-testing
Merge branch '2.4-testing' into 2.4-dev
Merge branch '2.4-dev' into 2.5-testing
Merge branch 'mongo-behavior-change' into 2.5-testing
1171509 - FastForwardXmlFileContext was sometimes finding the wrong file and was not cleaning up after itself.

Add 2.5.0 -> 2.5.1 upgrade instructions