websocket -

Adds support for a websocket connection in Nit

Uses standard sockets

websocket (lib/websocket)
- examples (lib/websocket/examples)
  - websocket_server: Sample module for a minimal chat server using Websockets on port 8088 (lib/websocket/examples/websocket_server.nit)
- websocket: Adds support for a websocket connection in Nit (lib/websocket/websocket.nit)