Removing Duplicate Test

MapTranslationTest didn't seem to do anything that MapPropertyTranslationTest didn't do.
Test for No-Defensive-Copy of Maps

Test that maps will be used as is if there's no defensive copying of the map.
Initial Support for Map Key Translation

Supporting map translation by allowing the key to be translated by the presence of a keyClass on the @MapProperty.

Part of issue #37.
Map Key Translation with keySource

Support for translating map keys with a defined source expression, along with a securities-based test showing translation to market holdings.

Part of issue #37.