Adding support for transform-origin to the 2d library#21

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heygrady wants to merge 10 commits intolouisremi:masterfrom

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Commits on Dec 1, 2011

correcting the matrix multiplication, some values were transposed because of a confusion between row-major and column-major.
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- changing default centerOrigin to "position" instead of "margin"
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Commits on Dec 2, 2011

respecting existing margins when using margin for origin faking
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Commits on Dec 7, 2011

starting on adding animation support for transform origin (for laffs)
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Commits on Dec 16, 2011

Commits on Dec 17, 2011

Commits on Jan 4, 2012

changing to double quotes to match jQuery standard.
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