Added "spiral" and "center path" options for the Arc path, rotation support#14

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DanielSchaffer wants to merge 4 commits intoweepy:masterfrom

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Commits on Aug 31, 2012

added spiral and center path options to the Arc path
DanielSchaffer
committed
added spiral and center path options to the Arc path
DanielSchaffer
committed
fixed whitespacing; re-added accidentally removed $.fx.step.path method; simplified center coordinate assignment for arc's center path animation
DanielSchaffer
committed
added plugin-wide support for rotation; moved existing rotation algorithm into 'followPath' rotator; added 'spin' rotator
DanielSchaffer
committed