Remove use of NSNotificationCenter

[acegreen]

you always have the instances of SKSplashView and SKSplashIcon handy so you can call their functions without the need for NSNotificationCenter. You can also add a callback to any function where you ned to know when its done (ie stopAnimation for SKSplashIcon)

[sachinkesiraju]

That's a good point, I'll try to find the time to refactor the library but in the meantime feel free to submit a PR.

[sachinkesiraju]

Fixed.