lib/websocket: Added sample code for a Websocket server

Signed-off-by: Lucas Bajolet <r4pass@hotmail.com>

diff --git a/examples/websocket_server.nit b/examples/websocket_server.nit
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+++ b/examples/websocket_server.nit
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+# This file is part of NIT ( http://www.nitlanguage.org ).
+#
+# Copyright 2014 Lucas Bajolet <r4pass@hotmail.com>
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# Sample module for a minimal chat server using Websockets on port 8088
+module websocket_server
+
+import websocket
+
+var sock = new WebSocket(8088, 1)
+
+var msg: String
+
+if not sock.listener.still_alive then
+       print sys.errno.strerror
+end
+
+sock.accept
+
+while sock.listener.still_alive do
+       if not sock.connected then sock.accept
+       if stdin.poll_in then
+               msg = gets
+               if msg == "exit" then sock.stop_server
+               if msg == "disconnect" then sock.disconnect_client
+               sock.write(msg)
+       end
+       if sock.can_read(10) then
+               msg = sock.read
+               if msg != "" then print msg
+       end
+end
+