Add Formatter Unit Test libraries and update Caraya functions.

• Create unit test libraries for default formatter and JSONLFormatter classes.
• Update current unit tests to incorporate formatter.
• Fix broken tests.
• Update deprecated Caraya functions.

This exercise also highlighted some minor backwards compatibility issues that Formatter introduced (ISO timestamps), these have been corrected.

Previous unit tests were using deprecated Caraya assert functions so I took the opportunity to update them also.