Update recline.view.ChoroplethMap.js

This PR allows for decimals up to two places for the hover label.

Before this PR a number like .57 would show as 0.

### Acceptance test

Decimals should show up in the label like the following picture:
![screen shot 2014-11-12 at 8 56 21 am](https://cloud.githubusercontent.com/assets/512243/5012219/ea3a4f06-6a49-11e4-8569-30887d080229.png)