Thread safety of SimpleDateFormat avoided.

Removed static reference to SimpleDateFormat due to thread safety
issues. Thanks to @imrandy85 for the report.
Updated jar.
Created a javadoc jar.  Hope I did it right?
Added support for new 'token' field.
Added support for new CardSet field, 'total'.

Added the field as well as a new test for that field.
Added new api calls to support random cards.

Two new API calls available.  getRandom() and getRandom(String setId).
Also added tests to support these calls.
Updated jar.
Date format updated again.

Updated to the kinder, simpler Date format provided by the API
Updated jar with new Dates