Feature: Blog Post Page

We need to evaluate which syntax highlighting library to use. Here are some to review:

* http://prismjs.com/
* https://highlightjs.org/

Design from @charlitoss below:

![Blog Post](http://f.cl.ly/items/1I2U0Q3v0C0l1x0v1s1H/cbbits-post.png)
This works even if not explicitly passed because this is only called by [line 6 of byline.html](https://github.com/citrusbyte/bits/pull/6/files#diff-828d3e82f6d8bf41a212d3ecb720053cR6)

It might be more readable / less magical to explicitly pass the date param in line 6 of byline.html...