@dblock => localizing art in images post

Adds mathjax for latex rendering and talks about cropping images with some background information.
Good one. The SEO juice must flow!

![screen shot 2014-09-24 at 10 47 43 am](https://cloud.githubusercontent.com/assets/4393191/4390003/c5419586-43f9-11e4-9175-18832433e3b8.png)