Molecules source

Hi Brad,

I wanted to thank you for making the molecules source available. As someone learning iOS it has been invaluable to help understand how to do universal work.

I do have a question... very general...

I took your concepts in Molecules and created a base empty project that I could use as a starting point. Basically I ripped out all of the molecule stuff and added a few of my own things. For the longest time the app would just simply crash on startup. I spent a lot of time side-by-side comparing it to molecules and was convinced everything was identical. Still it crashed.

On a whim I drug over your three default png files located at the top of the project and suddenly my app worked. In searching the code I could find no direct references to the default file but just having them there seems to be important. I did a few web searchings and really couldn't find much on this.

Can you tell me briefly why the default files seem to be required? Did I just miss something?

Thanks!