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Code cleanup for physics (#9193)

* Add tolerance argument to FrictionSimulation.
* Change FrictionSimulation.through to setting tolerance
  via the constructor rather than afterwards.
* Allow SimulationGroup constructor to take tolerance argument.
* Add a toString for SpringDescription.
* Add a toString for SpringSimulation.
* Push this change to BouncingScrollSimulation.
I
Ian Hickson committed
cf991a3412ee9e5feb2fc8002791c18f9d02c519
Parent: dcd3833
Committed by GitHub <noreply@github.com> on 4/5/2017, 12:21:10 AM