Add vulcanize to tools.

tools/vulcanize/node_modules/vulcanize/node_modules/cheerio/node_modules/htmlparser2/lib/ProxyHandler.js

Index: tools/vulcanize/node_modules/vulcanize/node_modules/cheerio/node_modules/htmlparser2/lib/ProxyHandler.js
diff --git a/tools/vulcanize/node_modules/vulcanize/node_modules/cheerio/node_modules/htmlparser2/lib/ProxyHandler.js b/tools/vulcanize/node_modules/vulcanize/node_modules/cheerio/node_modules/htmlparser2/lib/ProxyHandler.js
new file mode 100644
index 0000000000000000000000000000000000000000..1f9f38a7613464b7ec4f85a041f6abcfa7ad4b51
--- /dev/null
+++ b/tools/vulcanize/node_modules/vulcanize/node_modules/cheerio/node_modules/htmlparser2/lib/ProxyHandler.js
@@ -0,0 +1,27 @@
+module.exports = ProxyHandler;
+
+var ProxyHandler = function(cbs){
+	this._cbs = cbs || {};
+};
+
+var EVENTS = require("./").EVENTS;
+Object.keys(EVENTS).forEach(function(name){
+	if(EVENTS[name] === 0){
+		name = "on" + name;
+		ProxyHandler.prototype[name] = function(){
+			if(this._cbs[name]) this._cbs[name]();
+		};
+	} else if(EVENTS[name] === 1){
+		name = "on" + name;
+		ProxyHandler.prototype[name] = function(a){
+			if(this._cbs[name]) this._cbs[name](a);
+		};
+	} else if(EVENTS[name] === 2){
+		name = "on" + name;
+		ProxyHandler.prototype[name] = function(a, b){
+			if(this._cbs[name]) this._cbs[name](a, b);
+		};
+	} else {
+		throw Error("wrong number of arguments");
+	}
+});