Updated to Chosen 1.1.0

I upgraded to Chosen 1.1.0 because the old version (0.9.5) was breaking
with newer versions of jQuery that don't include the browser property.
I chose to add a version suffix to the filenames in order to bust the
cache.  The new version of Chosen doesn't support the dark-select
styling that was previously applied in the header, so I removed those
stylings.

I understand if you don't want to accept this pull request based on the styling changes.  I've attached a screenshot of the new look:

![image](https://cloud.githubusercontent.com/assets/21784/3753172/cf71e42c-180f-11e4-9315-be0906a54643.png)

We've been having a lot of trouble because one of the things we use to modify the admin is including a new jquery and that breaks all of the other things that are using the admin.

I was only able to test against a new version of jQuery.

Thanks,