EAGLESIX-2687 updated port of Value
Added unit test module with test cases for Document
Added instanceof assertions to clone unit tests
Remove unnecessary new Object calls
EAGLESIX-2688 Minor changes. Added error codes to some Errors. Commented out a duplicate method.
EAGLESIX-2691 First stab at the templates VariadicExpressionT class.  It depends upon other classes that are not yet converted so it is not working.
Merge branch 'feature/mongo_2.6.5_expressions' into feature/mongo_2.6.5_expressions_Document
Merge branch 'feature/mongo_2.6.5_expressions' into feature/mongo_2.6.5_expressions_Variadic
Document updates and test cases
EAGLESIX-2691 Upgraded the files touched previously to use the new Factories/Templates.
EAGLESIX-2691 Renamed a test file to use the _test name.
EAGLESIX-2691 Renamed the test files I have enhanced to _test
EAGLESIX-2691 Added test cases for an argument being passed to the constructor (where none are expected).
EAGLESIX-2892 broke out and expanded DepsTracker into own class
EAGLESIX-2892 ported ParsedDeps
EAGLESIX-2698: Just added a couple simple test cases.
EAGLESIX-2695 Ordered functions to match the c++ code.  Minor grammar changes only.
EAGLESIX-2892 added DepsTracker unit tests
Updated ObjectExpression and corresponding test cases to mongo 2.6.5.  Made a change in FieldPathExpression to make an analogous change for a failing unit test case (addDependencies()) before bailing out on the test cases for now because so many are failing.  This may be due to more needed changes in FieldPath or FieldPathExpression.
docs from another pass thru the 2.6.5 value files

This one is pretty important so I wanted to make another pass through and capture any docs that I could glean from the original `value.cpp` and `value.h` files (and reorder things similarly to how they have them to make bug fixing easier).