Working attempt at updating the plugin to work with the new addressfield.json config schema.
Updating variable names to be more meaningful.
Updating tests to account for new config schema.
Adding new tests for new methods onlyKey and hasField.
Updating README to reference the new config schema. [ci skip]

Closes #1
Updating jQuery JSON in anticipation of a 1.0 API update.
Merge pull request #16 from tableau-mkt/addressfield.json-1.x

Add support for explicit field ordering.