title: knockout javascript foreach binding
body: <p>I'm trying to allow a user to create a casting and add an array of categories to this casting object.  I was trying to use knockout's foreach binding to the array of categories and let users add new categories to the casting.  I have created a jsfiddle to illustrate what I'm trying to explain here.<br>
  <a href="http://jsfiddle.net/msell/ueNg7/16/" rel="nofollow">http://jsfiddle.net/msell/ueNg7/16/</a></p>
  
  <p>The JSON object gets built up correctly as a user modifies a casting, but I cant quite get the list of castings to display.</p>