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Fixes #131 

Here are screenshots with both the article "description" which currently does not exist, and one without. I've left the top nav visible even when users are logged out, but we can display a small banner at the top with a short description of Practicing Ruby.

This is a first draft and I'm going to work on it over the weekend. Any feedback is always welcome!

**BONUS** I killed the background texture and I really like the results. Cleans up the entire design :+1: 

![screen shot 2013-07-27 at 9 54 36 am](https://f.cloud.github.com/assets/40662/866943/aa303b40-f6c4-11e2-9de5-03d562a99c00.png)
![screen shot 2013-07-27 at 9 54 43 am](https://f.cloud.github.com/assets/40662/866944/aa314db4-f6c4-11e2-9e9d-8b28241c902c.png)
![screen shot 2013-07-27 at 9 55 01 am](https://f.cloud.github.com/assets/40662/866945/aa3832be-f6c4-11e2-82f9-075d3465c912.png)