fix error 500 on style guide

http://rizzo.lonelyplanet.com/styleguide/ui-components/month-blocks

FROM:
---------

![screen shot 2014-12-05 at 12 02 18 pm](https://cloud.githubusercontent.com/assets/2614324/5320349/b2254960-7c76-11e4-80ec-bd4a8cf2fad6.png)

TO:
-----

![screen shot 2014-12-05 at 12 02 35 pm](https://cloud.githubusercontent.com/assets/2614324/5320353/beada1c8-7c76-11e4-952b-18a10905dadc.png)