Wide widget layout

The widget now has two layouts: wide and default which is narrow.
To get the wide or banner widget you have to add the widget_type parameter in the URL with the value wide. (?widget_type=wide).
![screen shot 2014-09-02 at 03 49 56](https://cloud.githubusercontent.com/assets/732015/4268956/6266859c-3cb6-11e4-8072-6b63855426b2.png)
![screen shot 2014-09-02 at 03 49 43](https://cloud.githubusercontent.com/assets/732015/4268959/65bcaba4-3cb6-11e4-89e4-424e09d9bdae.png)

Also, a scroll bar was added to correctly visualize the resources.