title: Xcode auto layout buttons not resizing
body: <p>I have looked at many tutorials and just can't seem to get Buttons to resize and layout properly using Xcode 6 auto layout.
  The tutorials that make the most sense just use Views as examples.
  Trying to build a Universal soundboard app with buttons arranged in the attached picture.
  I also tried putting all the buttons in one View container but still no luck.
  What am i missing?
  Thanks so much<img src="https://i.stack.imgur.com/PhKha.png" alt="enter image description here"></p>