Moved ranking to list comprehensions and using heapq #8
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There are two main changes in this PR. The first is to move the loops into list comprehensions through the use of two new functions: filename_score and path_score (a minor change to make that a little tidier was that line that do not match the pattern are given a score of zero). The second major change is to use the heapq library to find the best scores so that less sorting needs to be performed.