Removed margin-bottom from last p of .blog-footer

With this fix the contents of the footer are aligned to the middle instead of having extra bottom space. Here are the screenshots before and after..

![screen shot 2014-03-02 at 11 09 39](https://f.cloud.github.com/assets/125676/2303919/28ad5280-a1f3-11e3-950c-26e3c0bd2e0b.png)