Bugfix admin selects talk

Was getting some JS errors when attempting to select a talk. Turned out to be a simple misspelling in the TalksController.  I corrected that and also removed a CSS reference to an image that no longer exists. 

Same story on tests with this PR, I'm going to go through and start working on coverage of primary features to help identify this type of thing happening.

Image of bug:

![image](https://cloud.githubusercontent.com/assets/2453394/4342203/27eac290-4042-11e4-9c00-3d36149f4563.png)

Fixed:

![image](https://cloud.githubusercontent.com/assets/2453394/4342211/345cdd88-4042-11e4-9d93-286a54e783bb.png)