Updates the styleguide to support more content

[mtrythall]

This fleshes out the styleguide further, speaking to the following:

1. Typography examples
2. The basic section structure
3. A quick page on icons
4. Dates section
5. Photo feature

and more.

It does not include all the patterns from the site, as not everything is meant to be so reusable. But it should provide some more insight into common things. The photo feature is meant to allow editors to put two photos side-by-side, a feature requested for the blog (note, they need to be similar dimensions. We may expand on this in the future).

Other notes:

1. Includes a class name change for presenters. Now using .mini-profile.
2. Fixes a bug on presenter display name on the schedule.

This would go right into develop, but it's a sizable change and could use a quick pass.