Feature: basic tcp network module

[AlexandreGerault]

Start to implement a tcp communication using Boost.Asio library.

The first iteration of the implementation should:

• allow server to listen for new clients and accept them;
• allow a room to communicate to its users;
• allow client to read incoming data.

The client is represented by the tcp_connection class. The TCP server class (that accepts new connections) is represented by the tcp_server class.

The behavior that would redirect incoming data to the room will be implemented later.

[AlexandreGerault]

At the moment we have a basic communication behavior built on top of the TCP protocol. We send a packet on a very common way:

1. We code the size of the packet on the 2 first Bytes.
2. We write the packet to the rest of the buffer.
   It is now necessary to establish a protocol for the body of the content. A possible way would be like command messages such as:

• join room {id} ;
• chat send {message} ;
• connect {login} {password}
  Thus we would need a class/module to dispatch these messages to commands (using the command pattern).

The last examples requires SSL to be implemented.