Update jquery.multiselect.filter.js

Set filter plugin compatabile fo Jquery 2.0
Issue #434
Merge pull request #438 from andrey-boomer/patch-3

Update jquery.multiselect.filter.js
Merge pull request #429 from r4j4h/up-arrow-prevAll-fix

Based on documentation, in prevAll and nextAll, we always want the first...
Merge pull request #1 from ehynds/master

Updating to latest master