#186 Make all classes involved in rpc IsSerializable.
Merge branch 'master' into IsSerializable
Merge branch 'master' into IsSerializable
Merge branch 'master' into IsSerializable
Merge branch 'master' into IsSerializable
Merge branch 'master' into IsSerializable
Merge pull request #235 from HPI-Information-Systems/IsSerializable

Is serializable