Firefox Tab and Enter keys issue.

When item is selected by enter, the list is reopened.
Also pressing tab on focused element with drop list cause immediate reopening with empty search result list.
Merge pull request #610 from MaxxSoftware/master

Firefox Tab and Enter keys issue.
ready for single
add third param to matcher in local
add default initselection for single and multi
Merge pull request #715 from vitalets/default-initselection-hidden

Default initSelection() for hidden element