title: Select2: Display all search results which contain the characters in sequence
body: <p>I want to use <code>select2</code> search such that it also displays results which do not match the options strictly.</p>
  
  <p>Eg. If <code>hello world</code> is present in the select box, typing <code>hl</code> or <code>hw</code> should return <code>hello world</code> as search result.</p>