Heapq in Cython
This module is an adaptation of merge, nlargest and nsmallest from the heapq module in Cython. This makes it just a tad bit faster.
x 1.5 for nlargest and nsmallest (given a particular micro benchnmark of course). x 3 for merge. nlargest performance is comparable with cytoolz.topk (but cyheapq also provides nsmallest). merge is around 8 times faster than cytoolz.merge_sorted. The microbenchmark used involves sifting / merging 10e6 random floats.
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