EAGLESIX-2721 Minor corrections to ConcatExpression, test cases are complete and pass.
EAGLESIX-2721: now ours looks more like Mongo's
EAGLESIX-2721: test cases adjusted
EAGLESIX-2721: test case added and console.log statements removed
Merge branch 'feature/mongo_2.6.5_expressions' into feature/mongo_2.6.5_expressions_Concat
EAGLESIX-2651: Concat: better sync w/ 2.6.5 code (mainly reordering and code formatting), reformat tests a little bit
Merge pull request #72 from RiveraGroup/feature/mongo_2.6.5_expressions_Concat

Feature/mongo 2.6.5 expressions concat