While studying for QA quiz decided to add unit tests

Added a unit test for APrioriInfo class which is really simple.
Added a unit test for the ECKeyParam class

Added unit tests that verify that the default named curve is correct and
that an exception thrown if invalid named curve given.
Added a test for ECKey, it test the uniqueness of keys

This unit test needs to be improved as it is just a primitive test to verify
that keys are unique and there are no cycles, it does not check the that they
are uniformly random.
Added incomplete ECGKeyExchange unit tests

Will need to add the ECKeyUtil unit tests before implementing the unit
tests for this class as they are critical to testing this class.