EAGLESIX-2651: FieldPath: fix bug with var paths
Merge branch 'feature/mongo_2.6.5_expressions_Map' of http://github.com/RiveraGroup/mungedb-aggregate into feature/mongo_2.6.5_expressions_Map
EAGLESIX-2651: simplify misc base classes
EAGLESIX-2651: Map: better sync w/ 2.6.5 code, test more thoroughly, fix more variables related bugs