activeDuration tests. Also modified normalization tests to work again.
calculatePhase tests.
calculateActiveTime tests.
calculateScaledActiveTime tests.
calculateIterationTime tests.
calculateCurrentIteration tests.
calculateTransformedTime tests.
AnimationNode tests.
Responded to review comments.
Merge pull request #14 from shans/timingTests

Timing tests.
player
Added reverse() and finish(). Started writing some tests.
Lots of tests, tweaks to algorithms.