Updated tests to fail when trying to serialize an internal object with NSCoding
Updated encoder to encode NSCoding objects
Added more tests to make me believe it works correctly
Updated CMDecoder to also allow NSCoding objects to be decoded. Convinced myself in the tests that it works with nested objects.
Merge pull request #4 from cloudmine/nscoding

Add NSCoding Support to Serialization and Deserialization
Updated version to 1.6.4
Merge branch 'nscoding' into develop