GPII-738: Fixing problems in headings.

http://issues.gpii.net/browse/GPII-738
Yes, you should keep using the `<h1>` to `<h6>` tags as needed. I was suggesting though that the containing `<div>` should be a `<section>` since this will provide some semantic grouping and not just stylistic grouping. You can see from the HTML5 spec that `<section>` represents a generic section of a document or application. http://www.w3.org/TR/2014/WD-html5-20140617/sections.html#the-section-element