Make the "panel-title" easily clickable

![accordion-screenshot](https://cloud.githubusercontent.com/assets/5230079/3399761/f83d969e-fd3e-11e3-90a7-46612b912415.jpg)

I think this is useful because it makes the `accordion plugin` much easier to operate. With this change you can click anywhere on the `panel-title` and the link which opens the accordion will work just fine.

I hope it helps!

Best regards, Lubomir Georgiev.