EAGLESIX-2714: minor changes
EAGLESIX-2713: merge conflicts resolved
EAGLESIX-2714: all test cases pass
Merge branch 'feature/mongo_2.6.5_expressions' into feature/mongo_2.6.5_expressions_SetEquals
EAGLESIX-2714 Removed a spurious comma.
Merge branch 'feature/mongo_2.6.5_expressions' into feature/mongo_2.6.5_expressions_SetEquals
EAGLESIX-2714 Expression was inheriting from the wrong base class; Added missing error codes.
EAGLESIX-2714: removed extra code
EAGLESIX-2714 filled out test cases.
Merge branch 'feature/mongo_2.6.5_expressions' into feature/mongo_2.6.5_expressions_SetEquals

Conflicts:
	lib/pipeline/expressions/Helpers.js
EAGLESIX-2651: SetEquals: better sync w/ 2.6.5 code and tests; fix ManyArgsEqual test
Merge pull request #53 from RiveraGroup/feature/mongo_2.6.5_expressions_SetEquals

Feature/mongo 2.6.5 expressions SetEquals