title: How to globally order multiple ordered observables in Monix
body: <p>Suppose I have multiple iterators that are ordered. If I wanted to merge these iterators while globally ordering them (e.g. <code>[(1,3,4), (2,4,5)] -&gt; [1,2,3,4,4,5]</code>) using <a href="https://github.com/monixio/monix" rel="nofollow">monix</a> how would I do it?  </p>