Implement fast SLERP.
Some tweaks for performance testing.
More performance tests.
Remove performance tests. Use fast slerp implementation with typed arrays. Add one more test comparing with old slerp implementation.
Add fastSquad that uses fastSlerp, tests and doc.
Merge branch 'master' into fastSlerp
Update CHANGES.md.
Use fast functions by default for quaternion spline. Update error tolerance in tests.
Merge pull request #1370 from AnalyticalGraphicsInc/fastSlerp

Fast SLERP
Merge remote-tracking branch 'origin/master' into fixDataSourceChanged

Conflicts:
	CHANGES.md
Rearrange code to separate the DataSourceDisplay update from unrelated clock setting code.
Merge branch 'fixDataSourceChanged' into dataSourceBrowser

Conflicts:
	Source/Widgets/Viewer/Viewer.js
Fix clock tracking.