Give drag.revert an optional callback to notify when revert is complete.#112

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snesin wants to merge 1 commit intojupiterjs:masterfrom

snesin:patch-1

Commits on Jan 12, 2012

Give drag.revert an optional callback to notify when revert is complete. Uses existing _revert property that was already assigned to the optional parameter. Modified end method to test if _revert i…
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