CommonJS-compatible wrapper for dists

For non-node builds, wrap the dist code in an anonymous function. For
client-side CommonJS builds, set var io = module.exports.

bin/builder.js

@@ -83,6 +83,15 @@ var baseTransports = {
     ]
 };
 
+/**
+ * Wrappers for client-side usage.
+ * This enables usage in both top-level browser window and client-side CommonJS systems.
+ * If doing a node build for server-side client, this wrapper is NOT included.
+ * @api private
+ */
+var wrapperPre = "\nvar io = ('undefined' === typeof module ? {} : module.exports);\n(function() {\n";
+var wrapperPost = "\n})();";
+
 /**
  * Builds a custom Socket.IO distribution based on the transports that you
  * need. You can configure the build to create development build or production
@@ -168,10 +177,14 @@ var builder = module.exports = function () {
       // we are done, did we error?
       if (error) return callback(error);
 
-      // concatinate the file contents in order
+      // start with the license header
       var code = development
         , ignore = 0;
 
+      // pre-wrapper for non-server-side builds
+      if (!settings.node) code += wrapperPre;
+
+      // concatenate the file contents in order
       files.forEach(function (file) {
         code += results[file];
       });
@@ -183,6 +196,9 @@ var builder = module.exports = function () {
         });
       }
 
+      // post-wrapper for non-server-side builds
+      if (!settings.node)code += wrapperPost;
+
       code = activeXObfuscator(code);
 
       // Search for conditional code blocks that need to be removed as they