Closes #65 and #73.
Closes #72.
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Merge branch 'master' of https://github.com/julianshapiro/velocity into feature/spring-easing-plugin
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Removed caching and replaced with returning a closure that contains the calculated path;
Refactored springRK4 to take only a single options object argument;
Changed default tension to 600 and friction to 20
Integrated springRK4 easing
Merge branch 'master' into feature/spring-easing-plugin