mkschreder / orangerpcd / 88

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travis-ci

add first working version of local event queue allowing applications to send events to connected clients

- Event queue is implemented as a linux message queue
- Sever opens queue named /orangerpcd-events (default name) and starts a task
  listening for events
- Shell clients can send new events using (syntax is likely to change) shell
  command "orangerpcd-client broadcast <name> '{..data..}'"
- The event is sent to local queue (max event message size is typically 8k)
- Server task picks up the event and then forwards it to all connected clients
- Clients receive standard jsonrpc 2.0 event message as
  {"jsonrpc":"2.0","method":"<eventname>","params":{..data..}}

Note that event messages are same as a method call except that they don't have
an "id" parameter and they originate from the server to the clients.

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