Alternatives

Add support for showing a list of alternatives to both sections and specific comparisions.

![screen shot 2014-02-10 at 2 17 44 pm](https://f.cloud.github.com/assets/55347/2129520/603f7cde-9288-11e3-9bd0-70cb7fc27010.png)
![screen shot 2014-02-10 at 2 17 30 pm](https://f.cloud.github.com/assets/55347/2129521/6045cd96-9288-11e3-804d-376adfcd3c8d.png)