Mei-Hui Su ea833a780c Update to allow setting of globalCompositeOperation when
html <canvas> is used to process multiple tiledImages to blend
is a specific way.
(special handling,
   when compositeOperation is 'source-over' and opacity is 1,
   useSketch is false, otherwise useSketch is true
)
Valid values are 'source-atop', 'source-in', 'source-out',
  'destination-over', 'destination-atop', 'destination-in',
  'destination-out', 'lighter', 'copy' or 'xor'
http://www.w3schools.com/tags/canvas_globalcompositeoperation.asp
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