Added a component.json for bower support

> Bower is a package manager for the web. Bower lets you easily install assets such as images, CSS and JavaScript, and manages dependencies for you.

http://twitter.github.com/bower/

Added a component.json for jquery-chosen so that it can be used with bower.

This is *not* a complete solution, as it does not account for the prototype version. As far as I can tell you can currently only specify one component.json per git repository.