Fixed Organization schema tag

While I was in there I noticed an error in schema markup...

Before
=====
![logo](https://cloud.githubusercontent.com/assets/76709/3186725/f9289d5e-eca6-11e3-8a83-8ee72a8ff418.png)

After
====
![logo2](https://cloud.githubusercontent.com/assets/76709/3186726/feb8c848-eca6-11e3-9dd6-69c703fd4595.png)