Removed unused context filter from RPC.
CORE: fixed up javadoc

 - removed testing println from RTMessagesManager
 - updated javadoc in interfaces (fix is based on IntelliJ Idea's
 code inspections)
Merge pull request #73 from tauceti2/rpcRemoveUnusedFilter

Removed unused context filter from RPC.
Perun licence.
Merge pull request #74 from zlamalp/cleanup

CORE: fixed up javadoc