Add Ronin::Network::Proxy

[postmodern]

Add Ronin::Network::Proxy

[postmodern]

As terminology goes, the Proxy will refer to incoming connections as "clients" that are connecting to the "server", via our Proxy. Some ideas for event callbacks:

• client_connected - When a client has connected to the proxy, but before a connection has been made to the server.
• client_disconnected - When a client has disconnected from the proxy.
• client_data - When data is sent from the client to the Proxy.
• server_connected - When the server has accepted the connection, after the client has connected to our proxy.
• server_disconnected - When the server closes the socket, before the client has decided to close it's socket.
• server_data - When data is sent from the Server to the Proxy.

Callback aliases:

• connect - Alias for server_connect.
• disconnect - Alias for client_disconnect.
• data - Alias for client_data or server_data events.

[postmodern]

Added Ronin::Network::Proxy, Ronin::Network::TCP::Proxy and Ronin::Network::UDP::Proxy. Just need to add specs for the logic, then they can be merged into the 0.5.0 branch.

[postmodern]

Minimal specs added for Ronin::Network::TCP::Proxy.