Release 0.4.1

Fixed

• Fix remove value buttons being activated on form submission. The W3C HTML5
  Button
  spec defines the default type of a button to be a submit button. This means
  that placing a multi select in a form could cause a remove value button to be
  activated when a form submission was requested by pressing the 'enter' key.
  The visible effect of this was that pressing enter in the form would remove
  multi values one by one until they were all gone. Setting the type of the
  remove button explicity to type="button" avoids this behaviour.