EAGLESIX-2717: basic port
Merge branch 'feature/mongo_2.6.5_expressions' into feature/mongo_2.6.5_expressions_SetUnion
EAGLESIX-2717: fixed typo
EAGLESIX-2715: test cases work
Merge branch 'feature/mongo_2.6.5_expressions' into feature/mongo_2.6.5_expressions_SetUnion
Merge branch 'feature/mongo_2.6.5_expressions' into feature/mongo_2.6.5_expressions_SetUnion
EAGLESIX-2717 SetUnion was inheriting from the wrong base class.
EAGLESIX-2717: strict equals
EAGLESIX-2717 Added a test case for null arrays.
Merge branch 'feature/mongo_2.6.5_expressions_SetUnion' of https://github.com/RiveraGroup/mungedb-aggregate into feature/mongo_2.6.5_expressions_SetUnion
Merge branch 'feature/mongo_2.6.5_expressions' into feature/mongo_2.6.5_expressions_SetUnion

Conflicts:
	lib/pipeline/expressions/Helpers.js
EAGLESIX-2651: Set*: use ValueSet instead of Helpers
EAGLESIX-2651: Set*: fix trivial issues
EAGLESIX-2651: SetUnion: better sync w/ 2.6.5 code and tests, use ValueSet
EAGLESIX-2651: SetUnion: add missing isAssociativeAndCommutative getter
Merge pull request #61 from RiveraGroup/feature/mongo_2.6.5_expressions_SetUnion

Feature/mongo 2.6.5 expressions set union