Initial import WebSocket Compression Protocol extension Permessage-deflate.

Added test cases for Permessage-delate valid parameters
Added a simple websocket example with compression.

examples/websocket_compress/ws.ini

@@ -0,0 +1,15 @@
+verbose=false
+verbose_level=INFORMATION
+port=9090
+max_concurrent_connections=10
+keep_alive_timeout=30
+max_tcp_clients=30
+socket_timeout=30000
+max_keep_alive_requests=3000
+
+### SSL settings
+# enable SSL, with file certificate.
+ssl_enabled=false
+ssl_ca_key=server.key
+ssl_ca_crt=server.crt
+