Social share links

adds social share links to show pages. Layout is rough this pass, needs the page to form up around em.

closes #690 

![screen shot 2014-10-17 at 11 35 28 am](https://cloud.githubusercontent.com/assets/1239550/4672793/4b7dab64-5596-11e4-8e43-ddf5c305d92b.png)
![screen shot 2014-10-17 at 11 35 20 am](https://cloud.githubusercontent.com/assets/1239550/4672792/4b7ad16e-5596-11e4-9758-071f1abf2e2e.png)
![screen shot 2014-10-17 at 11 35 11 am](https://cloud.githubusercontent.com/assets/1239550/4672794/4b80472a-5596-11e4-96b7-948b78f2618e.png)
![screen shot 2014-10-17 at 11 34 55 am](https://cloud.githubusercontent.com/assets/1239550/4672795/4b83dc50-5596-11e4-992f-4f1acae60f30.png)