Issue #111: Adding embed widget to all visualizations

Nucivic/nucivic-internal#111 

## Acceptance Test

- [x] All visualizations bundles that inherit from visualization entity should present an embed button.

![screen shot 2014-09-25 at 3 53 13 pm](https://cloud.githubusercontent.com/assets/428070/4410363/6c8f60e8-44e5-11e4-8373-4da5980fa61c.png)

- [x] If i click on the button it should toggle a text area with info about the iframe tag needed to embed that viz

![screen shot 2014-09-25 at 3 54 03 pm](https://cloud.githubusercontent.com/assets/428070/4410377/7e6b7b4e-44e5-11e4-86c8-411ee880ec7d.png)