added test for custom search event for input with type of search

created test for the custom event `search` that webkit browsers fire when entering anything on an `input[type=search]`

I tested it on 

Safari
Chrome and Chrome Canary
Opera 12.16 and Opera 15 to see the test change since the webkit change
Firefox
Ie7 and ie9

This is definitely just a proposal to add this test, and am not sure of any browsers' (other than webkit) future implementation of the `search` event.