made ws server write operations truly asynchronous

separated WebSocket interface and implementation
introduced WebSocketFactory to allow users to better customize their websockets

Author: Davidiusdadi

example/ChatClient.java

@@ -110,7 +110,6 @@ public void onMessage( String message ) {
 					public void onOpen( ServerHandshake handshake ) {
 						ta.append( "You are connected to ChatServer: " + getURI() + "\n" );
 						ta.setCaretPosition( ta.getDocument().getLength() );
-						send( "\0" );
 					}
 
 					@Override

example/ChatServer.java

@@ -26,7 +26,7 @@ public ChatServer( InetSocketAddress address ) {
 	@Override
 	public void onOpen( WebSocket conn, ClientHandshake handshake ) {
 		try {
-			this.sendToAll( "\0" );
+			this.sendToAll( "new connection" );
 		} catch ( InterruptedException ex ) {
 			ex.printStackTrace();
 		}