[RPG-2] : The server use a messageQueue to keep messages from client in
cache. Every time a user send a message, it is pushed into the queue.
[RPG-8] : The user can ask to the node server if there is any new
message. If so, the server respond with the messages. Now, several users
can discuss with the chat.
Merge branch 'dev' of https://github.com/Ylina/BadSpicyCatOfTheSpaceWhoPlayMusic.git into dev
Adding the messageQueue class file for the server.