Optimizations.

- Removed unused "IE_VERSION";
- ++i is faster on IE 8-;
- faster clamp (inline if > Math.max/min on IE8- | jsperf.com);
- very fast matrixMultiply() (expanded calculations);
-
Create excanvas-modified-sencha.js
Create excanvas-diff.patch
Update excanvas-diff.patch
Create About.md
Update About.md
Update About.md
Applied Sencha Patch

Applied Sencha Patch Manually:

"This page shows the results of the modifications to ExCanvas.
Fixes include:

runtimeStyle is only used when it exists. Fixes creating images using the Image constructor.
Replaced VML group + image combination with DIV's.
Use AlphaImageLoader to fix transparent PNG's.
Apply scaling to width and height of image instead of using the DXImageTransform.Microsoft.Matrix() for better scaled image quality.
IE8 Standards mode is fixed as a result of previous changes
Apply current font style to textMeasureEl to get correct size when using ctx.measureText()
Added ctx.globalAlpha support on all types of images.
Fixes translation inprecision when rotating. (clear when animating)."


http://stackoverflow.com/questions/12724404/getting-ie8-compatibility-with-easeljs-and-explorercanvas

http://dev.sencha.com/playpen/tm/excanvas-patch/
http://dev.sencha.com/playpen/tm/excanvas-patch/excanvas-modified.js
http://dev.sencha.com/playpen/tm/excanvas-patch/excanvas-diff.patch
Rename enhancements/About.md to enhancements/sencha-patch/About.md
Rename enhancements/excanvas-diff.patch to enhancements/sencha-patch/excanvas-diff.patch
Rename enhancements/excanvas-modified-sencha.js to enhancements/sencha-patch/excanvas-modified-sencha.js
Update About.md
Update About.md
Create excanvas-base-sencha.js
Merged from jqPlot's repository (b233cde)

https://bitbucket.org/cleonello/jqplot/src/b233cdeb2e574e323dacd7e54eb379d20aeb3811/src/excanvas.js
Optimizations
Update excanvas.js
Reverting shit I did.
Enhacements
Update excanvas.js