Fix for jQuery hotkeys being triggered in password fields.

If you're in an input box of the password type, your hotkeys will still be triggered, unlike for normal input fields, because it only checks for event.target.type === "text". I've fixed that in this fork by also checking for "password", based on the details listed on [Google Code](http://code.google.com/p/js-hotkeys/issues/detail?id=84).

This is my first GitHub pull request. And my first contribution to another open source project. I think I did everything right (not that there was much to it).