Fix issue #213

Mocha tested in:

Chrome 32.0.1700.107 (ok)
Firefox 27.0.1 (Button/Serch error)
IE10 (Button/Serch error)
IE10[IE9 Mode] (Button/Serch error)
IE10[IE8 Mode] (ok)
IE10[IE7 Mode] (ok)

i think the problem is in the test, more specifically in fireKeyUp function
The event now is 'oninput' not 'onkeyup' and we need to change the function to support this new event.

Manually tested (Issue #213) in:

Chrome 32.0.1700.107 (ok)
Firefox 27.0.1 (ok)
IE10 (ok)
IE10[IE9 Mode] (ok)
IE10[IE8 Mode] (ok)
IE10[IE7 Mode] (ok)