Fixed bug in DropController.retrieve() where a special state led to a drop message be handled twice or more times. #200
Added rationale comment to DropController.retrieve() why InvalidKeyExceptions won't be handled
Pass DropController.sendAndForget() exception to logger for better stacktrace analysis
Pass exception in DropController.handleDrop() to logger
added de-/serialization of multi sub-keys of QblPrimaryKeyPair
added de-/serialization of multi sub-keys of QblPrimaryPublicKey
added multi sub-key support to class Contact:
- new getter for retrieving list of sub-keys
- marked old getter @Deprecated
- changed name of sub-key setters from setX to addX
changed modifiers of generateEncKeyPair() and generateSignKeyPair() to public
changed contactTest() for testing multi sub-key serialization
changed syncedSettingsTest() for testing multi sub-key serialization
Removed generic parameter from DropSerializer
Removed redundant generic parameters from test DropMessageGsonTest methods
Introduced as()-method in ModelObject to syntactically work-around casts e.g. when using DropMessage.data objects
Merge pull request #212 from aBothe/pr

Fixed DropController.retrieve()-Bug; Improved exception logging
Merge pull request #220 from aBothe/genericremoval

[Drop] Stripped generic parameter from DropSerializer
Merge pull request #219 from f-porter/Issue-206-add-multi-sub-key-serialization

Issue 206 add multi sub key serialization