index: fix minor typo.
don't set buttonWidth if it's set to auto

setting width = auto on element will prevent the element from being
formatted via CSS
Added the input event when for the filter listener
Merge pull request #217 from micrypt/patch-1

index: fix minor typo.
Merge pull request #221 from Powerhamster/width-patch

don't set buttonWidth if it's set to auto
Merge pull request #226 from cedricdeschenes/firefox-key-events

Firefox Mobile issue when filter is on
Fix deselect and select option when using options with empty values