title: Creating a union of 2 bezier paths
body: <p>I have two bezier paths that i'd like to combine to form a union, so that I can stroke the entire outer shape. In my case, it's a speech bubble with a tail, so although it's not a complex shape it would actually be quite hard to create it using one single path.</p>
  
  <p>There doesn't appear to be a Core Graphics API for creating unions. Am I wrong?</p>
  
  <p>If I'm not, does anyone know of a library that can handle this? I've search GitHub to no avail.</p>