Remove code relating to parallel execution from PeriodicalExecuter. #23

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arbales wants to merge 2 commits intoprototypejs:masterfrom

Commits on Jul 16, 2011

In PeriodicalExcuter, removed unnecessary `currentlyExecuting` ivar and other code relating to parallel execution.
arbales
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Check to ensure that `this.timer` doesn't exist before assigning it in `#start`
arbales
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