Update jQuery.maskedinput to use GruntJS instead of Jake

.gitignore

@@ -1,2 +1,4 @@
 
 .idea/*
+
+node_modules/

README.md

@@ -13,3 +13,17 @@ If your requirements aren't met by the predefined placeholders, you can always a
 
 By design, this plugin will reject input which doesn't complete the mask. You can bypass this by using a '?' character at the position where you would like to consider input optional. For example, a mask of "(999) 999-9999? x99999" would require only the first 10 digits of a phone number with extension being optional.
 
+Setting up your Developer Environment
+-------------------------------------
+jQuery Masked Input uses [NodeJS](http://www.nodejs.org) and [GruntJS](http://www.gruntjs.com) as it's developer platform and build automation tool.
+
+To get your environment setup correctly, you'll need nodejs version 0.8.25 or greater installed. You'll also need to install the grunt command line tool:
+
+    $ sudo npm install -g grunt-cli
+
+Once node is installed on your system all that you need to do is install the developer dependencies and run the grunt build:
+
+    $ npm install
+    $ grunt
+
+All of the tests for jQuery Masked Input are run using the [jasmine](http://pivotal.github.io/jasmine/) test runner.