Add Mobile Support

[spencerfinnell]

Chosen should be initialized on mobile otherwise selects with dynamic results (via AJAX, etc) will not function as expected.

Steps to reproduce

Tell us how to reproduce this issue.

1. Setup an instance that populates results via AJAX such as https://github.com/easydigitaldownloads/easy-digital-downloads/blob/release/3.0/assets/js/admin/components/chosen/index.js#L51

2. Attempt to use on a mobile browser.

Expected behavior

Dynamic results should be retrieved regardless of the browser used.

Actual behavior

Native select inputs are loaded so additional results cannot be retrieved.

Environment

• Chosen Version: 1.x/2.x

• jQuery or Prototype Version:

• Browser and Version: Mobile

• OS and Version: Mobile

[Zardoz89]

So, the problem really it's populating it on a dynamic way. Not that not works on a mobile environment.
I use the old version on a responsive environment, and I not noticed any issue with mobile browsers, but I use static content from the server.