Added new Observe cancellation and updated dependent Block behavior (bumped version and Sc dependency version).
Clean-up with major renaming.
Fixed missing Query in URI string.
Improved variable size notifications.
Improved Block+Observe handling.
Updated copyright info.
Restructured ETSI Plugtests package and renamed client to checker (it only checks server behavior and does not test client API).
Fixed Link Format hasObservable() and improved getTitle().
Excluded entry point resource from Link Format serialization (i.e., only children now).
Added automatic Observe re-registration.
Extended CoapClient API.
Added PlugtestClient to test client functionality with CoapClient API.