should be keydown for non-character keys' sake
add spacebar for checkbox toggle
when closing menu, focus the button
Merge branch 'master' of github.com:peytons/jquery-ui-multiselect-widget

# By Peyton Sherwood
# Via Peyton Sherwood
* 'master' of github.com:peytons/jquery-ui-multiselect-widget:
  when closing menu, focus the button
  add spacebar for checkbox toggle
  should be keydown for non-character keys' sake
Fixed unit test