Code efficiency improvements, shrink file size, & more

Found some inefficiencies in your code that just made it a little more messy and difficult to read. I cleaned up most of it, but I couldn't test it (but I'm 95% sure it works as expected), so pull this request then test it on one of your projects and see that it produces the same result as before the pull. Otherwise, contact me if you need me to fix any errors I may have made.

Also, may I recommend you use just a simple Layer* for your circles instead of a bunch of bitmap layers. I didn't have time to write this in but it would be much easier to manage and much better for pebble's memory usage.

Have a good one.