Chosen update

This commit contains update of the plugin to use Chosen 1.0.

Because of the internal changes of the plugin I had to modify "should keep the options previously selected'' test. Chosen scans the results coming from the server in order to make sure that the value returning data match query in the search field. Previous version of the test use 'banana' as query but the results was 'Chiquita' and it was breaking the test.