title: jquery-knob always NAN in angular directive
body: <p>I've seen this article: <a href="https://stackoverflow.com/questions/24614212/jquery-knob-displays-nan-when-value-is-0">jQuery Knob displays NaN when value is 0</a>. It doesn't seem to answer my question.</p>
  
  <p>I'm using angular-knob inside a re-usable directive with isolate scope. The problem is, that the knob is alwyas "NaN", and never affects the model.</p>
  
  <p>Also, I pulled the directive from the angular-knob project and made it a directive of the main application, as importing the ui-knob module wasn't working either:</p>
  
  <pre><code>app.directive("knob", function () { //Doesn't crash
  return {
  vs...
  var app = angular.module("app", ["ui.knob"]); //Injection exception occurs.
  </code></pre>
  
  <p>Here's a plunker: <a href="http://plnkr.co/edit/g6UK6RIFA2xfT59z8sjN?p=preview" rel="nofollow noreferrer">http://plnkr.co/edit/g6UK6RIFA2xfT59z8sjN?p=preview</a></p>
  
  <p>Does anyone know how to solve this?</p>
  
  <p><strong>EDIT:</strong> I created another version, much simpler, except that the manual compilation doesn't seem to work: <a href="http://plnkr.co/edit/naG6ObMtad8nvHGOrhwI?p=preview" rel="nofollow noreferrer">http://plnkr.co/edit/naG6ObMtad8nvHGOrhwI?p=preview</a></p>