exposes .Types, adds basic string test
handling for null, conversions from int to string
scalable string conversion tests
test reproducing error - failed transform is adding bizarre field to mappedObject
hack for complex use of getKeyValue()
tests, Type conversions for .objectId() via mongo-core
v0.3.0
Update README.md
Merge pull request #3 from russmatney/enforce-data-types

Enforce data types