Results 2 issues of Dan E

``` Uncaught TypeError: Cannot read property 'activity_id' of undefined ``` `activity_id` doesn't seem to exist. ![screen shot 2014-05-02 at 16 02 56](https://cloud.githubusercontent.com/assets/781658/2863917/aa0e55e4-d20a-11e3-9e19-d55108363861.png)

This change updates the name properties of the fonts to `FiraFlott-Medium` and `FiraFlott-Italic` as outlined in the issue comment. Point number 2 raised in issue https://github.com/kosimst/FiraFlott/issues/1