new class:
* QblPrimaryKeyPairTypeAdapter
new class:
* QblKeySerializationTest
-> test is not working yet as there is missing a proper equals() method for QblPrimaryKeyPair
Added equals method to QblPrimaryKeyPair and its contained classes:
* QblEncKeyPair
* QblPrimaryPublicKey
* QblPublicKey
* QblSignKeyPair
Made test for QblPrimaryKeyPair serialization working
Merge pull request #131 from f-porter/Issue130-Implement-QblPrimaryKeyPair-serialization

Issue130 implement qbl primary key pair serialization