Added ability to get size of unprocessed data of message.
Merge branch 'master' of https://github.com/FreeOpcUa/opcua-mappings
Merge pull request #11 from treww/master

Ability to get size of data wasn't processed.
Merge branch 'master' of https://github.com/FreeOpcUa/opcua-mappings
Adding object with Addnodes service works!