Interface updates

Related to https://github.com/Quartz/Chartbuilder/issues/30

This mostly implements the changes I had made to ours concerning the CSS and HTML changes.

* Moves data input to the right and makes headings with numbers to help show workflow.
* Makes it so that the columns are percentage based so that different sized windows will work.
* Changes things to use em's instead of pixels which help scale for things like Retina displays.
* Overall cleanup of styles.

I am not sure where you would want to go further with this?