Bug fix

Fixes minor issue with completion block

Resolve namespace issue

• Rename the INTUDefines.h file to INTUGroupedArrayDefines.h

Generics, Nullability Annotations, and a fix

• Fix a crash when canceling an animation from within an animation block. See #3 for more details (thanks @Naxum!).
• Add nullability annotations and generics throughout the library. In particular, this improves how the API bridges into Swift.

Improve compatibility of Spring Solver

• Use a preprocessor macro to define the number of spring solver dimensions so that it is always visible to client code as a compile-time constant

Minor enhancement

• Add check for invalid spring animation parameters

Spring Animation

• Add brand new Spring Solver library, a standalone generic C library to simulate the physics of a spring-mass system based on the one that powers Facebook's Pop
• Expose a new spring animation API on INTUAnimationEngine that uses this spring solver under the hood

Swift compatibility

• Fix an issue with the easing functions not being accessible in Swift code

v1.1.0: Animation Options

• Add a new API that takes a mask of animation options, including repeat and autoreverse

v1.0.0: Initial Release

Initial commit