Update to YRKSpinningProgressIndicators

I just pushed an update to my YRKSpinningProgressIndicator projects on github. Eric Roccasecca (from Startly) was kind enough to send me a patch to improve a few things in the code.

I applied the fixes to both the CALayer-based and NSView-based versions of the project. See the diffs and commit messages here and here (respectively) for more details.

Thanks again to Eric for taking the time to send in the improvements. Also, be sure to check out the product where they are using it: QuicKeys 4 for Mac. I’m even in the credits in their About window.