Overview search

Adding a search button on the top right.

- Opens a dialog
- For now, you can only enter a name to search for
- Pressing the button, or pressing enter, will immediately update the view

It doesn't do any requests to elasticsearch, since we get all elements at the moment. Would probably be nice to have if we would apply pagination and other stuff. But that's for another issue, another day.

#11 

![screen shot 2014-12-19 at 17 07 24](https://cloud.githubusercontent.com/assets/777823/5507248/d16e367a-87a1-11e4-97b3-219d5b7d6dfd.png)
![screen shot 2014-12-19 at 17 07 34](https://cloud.githubusercontent.com/assets/777823/5507250/d43909e8-87a1-11e4-8452-9aac62bf3702.png)