Minor tweaks, improvements, spellchecking, standardization #6
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Minor spelling fixes in description; adds -ms- prefix to @mixin scale
for free IE9 support; adds variables to @mixin shadow; adds default duration
and standardizes capitalization of @Mixins scaledown, scale up, fadein;
moves functions black and white to directly under opacity; switches
names of center-h and center-h—unk for accuracy