Add vulcanize to tools.

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

Index: tools/vulcanize/node_modules/vulcanize/node_modules/cheerio/node_modules/htmlparser2/lib/WritableStream.js
diff --git a/tools/vulcanize/node_modules/vulcanize/node_modules/cheerio/node_modules/htmlparser2/lib/WritableStream.js b/tools/vulcanize/node_modules/vulcanize/node_modules/cheerio/node_modules/htmlparser2/lib/WritableStream.js
new file mode 100644
index 0000000000000000000000000000000000000000..e65b0732bbfbedddccea1e4c78fcaa93011410e8
--- /dev/null
+++ b/tools/vulcanize/node_modules/vulcanize/node_modules/cheerio/node_modules/htmlparser2/lib/WritableStream.js
@@ -0,0 +1,21 @@
+module.exports = Stream;
+
+var Parser = require("./Parser.js"),
+    WritableStream = require("stream").Writable || require("readable-stream").Writable;
+
+function Stream(cbs, options){
+	var parser = this._parser = new Parser(cbs, options);
+
+	WritableStream.call(this, {decodeStrings: false});
+
+	this.once("finish", function(){
+		parser.end();
+	});
+}
+
+require("util").inherits(Stream, WritableStream);
+
+WritableStream.prototype._write = function(chunk, encoding, cb){
+	this._parser.write(chunk);
+	cb();
+};