Added payment options component, a few small features, and several fixes

We love the selfstarter platform and used it for our new site at ByteLight.  Just sent a more in-depth email to hello@lockitron.com.

There were a few additional features that we needed, so we made sure to add them to a public fork of your project so that we could later make a pull request, and hopefully get them added back into the project so that others can use them in the future.

The main feature we added was a "payment options" component that let's you have a kickstarter-like section of radio buttons offering different packages or levels on the checkout page.  

Also added an option to have a placeholder image that shows up instead of the video first frame (like you have on lockitron).  Fixed several bug fixes - especially for IE.  The base selfstarter.us is pretty broken in IE.

You can take a look at our site here:  http://preorder.bytelight.com/