Add web-socket-js support with packet re-ordering.

- web-socket-js is from http://github.com/gimite/web-socket-js. It is
  a flash object that emultates WebSockets.

Unfortunately, events (or packets) from the web-socket-js object can
get re-ordered so we need to know the packet order.

- So wsproxy.py prepends the sequence number of the packet when
  sending.

- If the client receives packets out of order it queues them up and
  scans the queue for the sequence number it's looking for until
  things are back on track. Gross, but hey: It works!

- Also, add packet sequence checking to wstest.*

include/base64.js

@@ -90,25 +90,30 @@ toBinaryTable : [
     41,42,43,44, 45,46,47,48, 49,50,51,-1, -1,-1,-1,-1
 ],
 
-decode: function (data) {
+decode: function (data, offset) {
+    offset = typeof(offset) != 'undefined' ? offset : 0;
     var binTable = Base64.toBinaryTable;
     var pad = Base64.base64Pad;
     var leftbits = 0; // number of bits decoded, but yet to be appended
     var leftdata = 0; // bits decoded, but yet to be appended
 
     /* Every four characters is 3 resulting numbers */
-    var data_length = data.indexOf('=');
-    if (data_length == -1) data_length = data.length;
-    var result_length = (data_length >> 2) * 3 + (data.length % 4 - 1);
+    var data_length = data.indexOf('=') - offset;
+    if (data_length < 0) data_length = data.length - offset;
+
+    var result_length = (data_length >> 2) * 3 + ((data.length - offset) % 4 - 1);
     var result = new Array(result_length);
 
     // Convert one by one.
     var idx = 0;
-    for (var i = 0; i < data.length; i++) {
+    for (var i = offset; i < data.length; i++) {
         var c = binTable[data[i].charCodeAt(0) & 0x7f];
         var padding = (data[i] == pad);
         // Skip illegal characters and whitespace
-        if (c == -1) continue;
+        if (c == -1) {
+            console.log("Illegal character '" + data[i].charCodeAt(0) + "'");
+            continue;
+        }
         
         // Collect data into leftdata, update bitcount
         leftdata = (leftdata << 6) | c;