Make skeleton of summary page

This adds some extra elements to the summary page to mockup various scenarios, primarily:
- What it looks like when you haven't answered a required question
- What actions are available in the footer when you have and haven't completed all the required questions for a given lot

![screen shot 2014-10-09 at 14 54 44](https://cloud.githubusercontent.com/assets/355079/4577441/54d1cdf6-4fbc-11e4-861d-502cf0cf9bdf.png)