Update colorizer.js to check for ANSICON and have colors on Windows

Check env variable 'ANSICON', and if exists, colorize the output.

@@ -33,6 +33,7 @@
 var require = patchRequire(require);
 var fs = require('fs');
 var utils = require('utils');
+var env = require('system').env;
 
 exports.create = function create(type) {
     "use strict";
@@ -79,7 +80,7 @@ var Colorizer = function Colorizer() {
      * @return  String
      */
     this.colorize = function colorize(text, styleName, pad) {
-        if (fs.isWindows() || !(styleName in styles)) {
+        if ((fs.isWindows() && env['ANSICON'] == null) || !(styleName in styles)) {
             return text;
         }
         return this.format(text, styles[styleName], pad);
@@ -93,7 +94,7 @@ var Colorizer = function Colorizer() {
      * @return String
      */
     this.format = function format(text, style, pad) {
-        if (fs.isWindows() || !utils.isObject(style)) {
+        if ((fs.isWindows() && env['ANSICON'] == null) || !utils.isObject(style)) {
             return text;
         }
         var codes = [];