Use websock.js in latency test. Fixes for Opera.

Convert latency test to use include/websock.js instead of direct
WebSockets handling.

Add support for configuring the maximum bufferedAmount. This allows us
to configure it high enough to get around a bug in bufferedAmount
reporting in Opera.

Add some latency test results for Opera 11 with WebSockets turned on.

docs/TODO

@@ -1,7 +1,5 @@
 - wstelnet: support CSI L and CSI M
 
-- mod_websockify module for Apache
-
 - create gevent version:
     http://nichol.as/benchmark-of-python-web-servers
     http://n01se.net/paste/QXO

docs/latency_results.txt

@@ -16,6 +16,14 @@ firefox 4.0b9 - WebSockets enabled
     Minimum Latency:                  5.00
     Maximum Latency:                  119.00
 
+Opera 11 - WebSockets enabled
+    Packets sent:                     3065
+    Packets Received:                 3064
+    Average Latency:                  9.56
+    40 Frame Running Average Latency: 8.15
+    Minimum Latency:                  4.00
+    Maximum Latency:                  53.00
+
 ---
 
 firefox 4.0b9 - no WebSockets