Improve time complexity of gaps() function #104
Merged
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The RangeMap.gaps() function previously iterated
over all ranges prior to the query range before
returning the first overlapping gap. This results
in a worst-case O(n) time complexity per query.
Now the gaps() function reuses the overlaps() code to
get an iterator to the first overlapping range in O(log(n)) time.
Fixes issue #103.