Fix #35 by mentioning unitless attributes. Other minor changes

Author: stowball

README.md

@@ -4,29 +4,30 @@
 
 ---
 
-**Usage:**
+#### Usage:
 
-* If possible, add correct `width` and `height` attributes to your image map images. You can override these in CSS to make them responsive.
+* If possible, add [correct, unitless](http://dev.w3.org/html5/markup/img.html) `width` and `height` attributes to your image map images. You can override these in CSS to make them responsive.
 * Add a link to jQuery in your page, preferably at the bottom just before the closing `</body>`
 * After jQuery, either in a `<script>` block or a separate file, call:
 
-`$('img[usemap]').rwdImageMaps();`
+```js
+$('img[usemap]').rwdImageMaps();
+```
 
 You may also want to wrap it inside a `$(document).ready()` function, like so:
 
-```
+```js
 $(document).ready(function(e) {
     $('img[usemap]').rwdImageMaps();
 });
 ```
 
----
-
-**Demo:**
+#### Demo:
 
-http://www.mattstow.com/experiment/responsive-image-maps/rwd-image-maps.html
+http://mattstow.com/experiment/responsive-image-maps/rwd-image-maps.html
 
 ---
 
 Copyright (c) 2012 [Matt Stow](http://mattstow.com)  
-Licensed under the MIT license *(see [LICENSE](https://github.com/stowball/jQuery-rwdImageMaps/blob/master/LICENSE) for details)*
+Licensed under the MIT license *(see [LICENSE](https://github.com/stowball/jQuery-rwdImageMaps/blob/master/LICENSE) for details)*  
+Minified version created with Online YUI Compressor: http://www.refresh-sf.com/yui/