Better work with npm tools

[madarche]

Make it possible to "require" the plugin.

The rationale is thoroughly explained in the following article
http://blog.npmjs.org/post/112712169830/making-your-jquery-plugin-work-better-with-npm

This article is a part of a series:

1. http://blog.npmjs.org/post/111475741445/publishing-your-jquery-plugin-to-npm-the-quick
2. http://blog.npmjs.org/post/112064849860/using-jquery-plugins-with-npm
3. http://blog.npmjs.org/post/112712169830/making-your-jquery-plugin-work-better-with-npm

[joequery]

Thanks for the PR! I'll need to make some small tweaks (like a comment explaining what that chunk is for, update the minified js, etc) but I'll get this merged in when I have time.

[madarche]

Cool. Thanks.