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Merge pull request #4 from zolrath/master

Add takeWhile and skipWhile to Array
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Add partition, partitionAll, and partitionBy

partition produces an array of arrays, each containing n elements, each offset by step (optional).
It also allows an optional padding array which will attempt to fill the last partition to n elements if short.
partitionAll allows the last partition to be less than n elements long without using padding elements.
partitionBy applies a condition to each element in array, splitting it each time the condition returns a new value.