Branch cache css color#8

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cotija wants to merge 2 commits intometsci:masterfrom

cotija:Branch_CacheCssColor

Commits on May 23, 2017

cache css colors in parseCssColor function
cotija
committed

Commits on May 25, 2017

Add a cache for css color strings. The getImageData takes a lot of time overall when there are lots of events
cotija
committed