Filter text is not trimmed

[serkanozer]

This is a problem when you type a filter starting or ending with space characters

Type " new south wales" or "new south wales " in the first example
Actual:
No options shown
Expected
New South Wales option should be shown

Whitespaces wrapping the filter should be trimmed so that intended value could be matched. This is also the default behaviour
in https://harvesthq.github.io/chosen/ and http://selectize.github.io/selectize.js/