Changes to date and time expression classes
Add DateToStringExpression.js
EAGLESIX-2706 expression Compare ported to mongo 2.6.5
Merge branch 'feature/mongo_2.6.5_expressions' into feature/mongo_2.6.5_expressions_Date
Added DateToString.js and started the test cases module
Added a few DateToString test case skeletons
Merge branch 'feature/mongo_2.6.5_expressions' into feature/mongo_2.6.5_expressions_Date
EAGLESIX-727 Expressions: Date-related expression comments, finish DateToString
Merge branch 'feature/mongo_2.6.5_expressions' into feature/mongo_2.6.5_expressions_Date
EAGLESIX-727 Expressions... DateToString.  evaluateInternal() change to return a null for null input
EAGLESIX-2719 expression Strcasecmp mongo 2.6.5 port
EAGLESIX-2720 expression Substr ported to mongo 2.6.5
EAGLESIX-727: Resolve conflicts in date classes
Merge branch 'feature/mongo_2.6.5_expressions' into feature/mongo_2.6.5_expressions_Date
Merge branch 'feature/mongo_2.6.5_expressions' into feature/mongo_2.6.5_expressions_Compare

Conflicts:
	lib/pipeline/expressions/CompareExpression.js
EAGLESIX-727: Get most test cases working for dates
Merge branch 'feature/mongo_2.6.5_expressions' into feature/mongo_2.6.5_expressions_Date
Merge branch 'feature/mongo_2.6.5_expressions' into feature/mongo_2.6.5_expressions_Compare
EAGLESIX-2704: Fixed functionality and test cases
EAGLESIX-727: Passing test cases for Date-related expressions