Style case-study page

Add some styling for a case study show page.

- Setup IE specific stylesheets
- Improve the slimmer setup
- Add presenter to interpret content store data
- Use components to build show page
- Add minimal styling for things not covered by the show page
Is this the way to organise these? It looks like it's a mixture of the top-level formats and the format display types. I guess it reduces duplication this way, I'm just wondering if we'll ever need to access them separately.