added code coverage for JSR107TCK-48.  Improved javax.jcache specification coverage to 95.9%.

3 lines left in Caching.java that can be covered with additional coverage.

Outstanding code coverage not attainable:
private constructor for static method only class.    (FactoryBuilder)

MutableConfiguration.listenerConfigurations is always set to non-null in constructor.  (it is set to ArrayList).
The MutableConfiguration equals code checks for null for the field and that can never happen.