iterator: Add IteratorUtil::max_by/min_by method
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`max_by` method returns the element that gives the maximum value from the specfied function. `max_by`/`min_by` are convenient when you want to get the value which has greatest/smallest scores. Inspired by [ruby's Enumerable module](http://ruby-doc.org/core-2.0/Enumerable.html).
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max_bymethod returns the element that gives the maximum value from the specfied function.max_by/min_byare convenient when you want to get the value which has greatest/smallest scores.Inspired by ruby's Enumerable module.