Improvements sidebar

This is partially implemented and currently displays the counts for each level given by the new endpoint along with the original bars:

![image](https://f.cloud.github.com/assets/51385/1562711/1fb41f4c-504f-11e3-927a-51ef8842e85c.png)

@JeniT - this is deployed to staging, do you have time to have a quick look to see if the numbers are as you'd expect?

I was going to implement each bar as the answered / current totals for the current and prior levels.

### Todo
- [x] don't display the input loaders for this request (feels a lot more sluggish than it is)
- [x] implement the calculation for the bar & render
- [x] generate the attained level

Resolves #659
Resolves #669