Fixed date issue where date failed to display.

Hi. I fixed the issue for the date not displaying. I made sure to add in the Glyphicons as well to match the theme. I found this solution on Octopress github page. <a href="https://github.com/imathis/octopress/commit/73e540409ceb8bc18048b6a96a4b815fc303ea28">See fix here</a>. I used that fix and added the Glyphicons for the calendar like you had previously. Solution show here:
![screen shot 2014-08-29 at 11 58 26 am](https://cloud.githubusercontent.com/assets/7376238/4093602/81bb2c92-2f9e-11e4-84b9-f1cd7b9454c6.png)

As a bonus, I also fixed the nil error by changing nil to null in atom.xml and robot.txt.

I use your theme A LOT. Thanks so much!