title: list of node-opencv function names
body: <p>I am having trouble locating the node-opencv equivalents of the functions in opencv 2.4. For instance, equalizeHist() is available. But I can't find can't find Scalar_ or GetMat(). </p>
  
  <p>I want a contrast function which is essentially Mat multiplied by Scalar. How do I find the equivalents in node-opencv to implement it?</p>