Fix a bug with default values for models and add the ability to query a specific key to see if it has been changed.
Fix a bug with default values for models and add the ability to query a specific key to see if it has been changed.

nicholasryan/CorePlus,nicholasryan/CorePlus,nicholasryan/CorePlus,nicholasryan/CorePlus,nicholasryan/CorePlus,nicholasryan/CorePlus,nicholasryan/CorePlus,nicholasryan/CorePlus