Make types more explicit to reduce complie times #8
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SpriteKit-Spring.swift was taking over 50 seconds to compile in Xcode 7.3.1 / Swift 2.2. This appears to be due to the type inference engine having to work very hard.
I have made a few changes to make the types more explicit and this has reduced compile times to a few hundred ms.
Fair warning! I haven't tested this change for anything other than the functions I am using in my project.