Copy message definition from server-game (and correcting a typo).
Merge pull request #1 from dchilot/master

Message definitions to be included as submodule.
Add recipient to base message.
Add message to move tank.
Optimize building for mobile devices

Due to a technical limitation, we're using protobuf-lite instead of the
full one.
Adding this line in front of the message will optimize it for the lite
runtime.
Remove recipient in message as zmq can filter at a higher level.
Add license.
Set files to organize messages by first sender.
Remove useless message.
Merge pull request #2 from dchilot/master

Optimize building for mobile devices. Set files to organize messages by first sender.
Add tests and messages.
Merge pull request #3 from dchilot/master

Add tests and messages.
Fix package name from .com to .messages