Adjustements for jquery update

Adjustements for jquery update

- Replaced .click(function) by .on('click', function)
- Replaced .click() by .trigger('click')
- Replaced .live(event, function) by .on(event, function)
- Replaced $(document).ready(function) by $(function)
- Replaced .bind/.unbind by .on/.off
- Replaced keypress events by keydown events, so that up/down keys get
supported again.

Thanks to the jquery-migrate project.