Apply defaults before calling super -initWithCoder

[ryanmasondavies]

Allows interface builder to override KGNoise defaults if needed. I needed this when the view kept coming out as grey regardless of the colors I set in IB.

[kgn]

This code maybe working but will most likely cause other problems because with this change setup would not be called because when it is called self has not been initialized yet so [self setup] would be a no-op. I updated the code so that the color is only changed to grey if self.backgroundColor == nil so this should solve your problem and maintain the rest of what setup does. Thanks for the pull request!

[ryanmasondavies]

Looks good! Thanks for merging.