koosha94

Fixed nth_element, added unary_nor

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This commit adds unary_nor, and nor1 as a logical operator. It also adds/fixes support for user defined types in nth_element.

improve nth element speed by using bucketselect or cutting plane instead of quickselect

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this work http://www.math.grin.edu/~blanchaj/Research/ABGS_KSelection.pdf , and a few other works such as http://arxiv.org/pdf/1104.2732.pdf, propose gpu accelerated algorithms for nth element selection. I believe using bucketselect presented in Alabi et al. would...