(#13) Add 'Save to Library' to images from stories

![34471188-9c0f-11e3-9e2c-fdbb49932254](https://f.cloud.github.com/assets/18567/2252734/0879f84a-9dae-11e3-828e-013f076f2f2b.png)
![37769e6e-9c0f-11e3-8609-5047f2b4c820](https://f.cloud.github.com/assets/18567/2252735/0ac6628c-9dae-11e3-9c0c-afd6b1380c50.png)