make the question bold to make it stand more out from the rest of the text

![screen shot 2014-08-15 at 19 49 54](https://cloud.githubusercontent.com/assets/170270/3936683/d6efaa80-24a4-11e4-93c5-66c8adc1e35d.png)

This is even more relevant with #142 as it makes the question and least underneath aligned.

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On a related note, can we please drop the `:` at the end of the question? It looks ugly.
I don't want the prefix bold. It looks better normal.