DKS - added automated test for drawLinesInstantShiftVariedOpacity().
Merge branch 'master' of https://github.com/caleb531/jcanvas
DKS - added a 1ms duration to the animateLayer_twoAddsTwoAnimates test.  Not sure why that's required (other tests succeed at 0ms), but not worried about it right now.
Merge branch 'master' of https://github.com/caleb531/jcanvas
Merge branch 'master' of https://github.com/caleb531/jcanvas
DKS - refactored "by-hand" tests to follow the jCanvas top-level documentation sections.
DKS - refactored unit tests to more closely match jCanvas documentation sections.
DKS - removed unneeded drawLayers call
Merge branch 'master' of https://github.com/caleb531/jcanvas
DKS - merged Caleb's unit test directory restructuring
Merge pull request #66 from dksmiffs/master

fix test code to reflect "tests" directory restructure