Basic Grunt tasks and Minor CSS improvements

Hi. I like your plugin very much and decided to do few changes to make the dev process better.

- I added Grunt tasks. Run `npm install` (with Node.js installed) to install dependencies. Then running `grunt` or `grunt build` will generate minified JS and CSS files into the `min/` directory using `src/` directory as a source.
- In your main CSS file I changed the padding property for `.jq-ry-container` to use more shorthand syntax. Also you don't need to specify `px` or `%` units for zero values.
- Fixed a small typo in the Readme

Some advices:
- You might want to publish this in <a href="http://bower.io/">Bower</a>. It will help you popularize your project at least a little.
- Check out <a href="http://semver.org/">Semver</a> and use it for versioning your project. It's a good and popular practice and will be appreciated.

Cheers.