@speednoisemovement: Darken blog text

https://news.ycombinator.com/item?id=6298542

OLD: 

![screen shot 2013-08-29 at 6 11 38 pm](https://f.cloud.github.com/assets/28120/1053874/4a868606-10f8-11e3-8582-1780cff23421.png)

NEW:

![screen shot 2013-08-29 at 6 11 01 pm](https://f.cloud.github.com/assets/28120/1053876/554c44cc-10f8-11e3-953f-6328c6b7cf70.png)

Note that I went with a very subtle purple rather than a straight black or charcoal. The oft-used `#333` seemed a little jarring against the off-white background:

![screen shot 2013-08-29 at 6 10 42 pm](https://f.cloud.github.com/assets/28120/1053886/795de76c-10f8-11e3-8e82-2858163cb454.png)