title: simple CATextLayer scaling problem
body: <p>I'm having a simple scaling problem with CATextLayer, but i just couldn't figure it out:
  I want the CATextLayer to proportionally grow in size with it's superlayer:
  if the superlayer's width is 300 the text size of CATextLayer should be 12 and if the supeview's width is 600 the text size should be 24.
  I couldn't find a working solution! </p>
  
  <p>Can you please give me a clue?</p>
  
  <p>Thanks, Julian.</p>