All simple DTO features

This pre-release completes the features of a simple DTO class to the original specification. v1 is being held back while a JSON-compatible design is completed.

DataObject getters

The following getters have been tested and implemented:

• getInt
• getString
• getBool
• getFloat
• getDateTime

A DataObject can also be converted to a nested array or object using the asArray and asObject methods.