added canonicalizr utility

bin/canonicalizr.js

@@ -0,0 +1,26 @@
+#!/usr/bin/env node
+/*
+Copyright (c) 2015, Yahoo! Inc. All rights reserved.
+Copyrights licensed under the New BSD License.
+See the accompanying LICENSE file for terms.
+*/
+
+var fs = require('fs'),
+	Canonicalizr = require('../src/context-parser').Parser;
+
+if (process.argv.length !== 3) {
+    console.log("Usage: canonicalizr filePath");
+    process.exit(1);
+}
+
+var html = fs.readFileSync(process.argv[2], "utf8");  
+var c = new Canonicalizr({
+	enableCanonicalization: true,
+	enableVoidingIEConditionalComments: true,
+	enableStateTracking: false
+});
+
+// do not use console.log(), which append an unnecessary linebreak
+// console.log() in nodejs v0.12 or below are vulnerable to eat %
+// ref: https://github.com/nodejs/node/issues/3396 
+process.stdout.write(c.contextualize(html));