window.SecurityPolicy.isActive() is now window.securityPolicy.isActive
since this is available only in Chrome Canary which has already been
updated, we can safely make this change without worrying about
backwards compatilibty.
Closes#1577
On IE9 the input event is not fired when backspace or delete key are pressed or when
cut is performed. This makes listening on the input event unreliable and therefore
it's better for us to just use keydown/change events instead.
Closes#879