Take filename argument from program arguments

Previously, I had hard-coded this. This commit also makes it so that
the script can be executed from any current working directory and
(hopefully) makes it platform agnostic by using os.path.join to build
the path to the stop words file.

06-code-golf/tf-06-bm.py

@@ -1 +1 @@
-print (reduce(lambda string, tup: string + tup[0] + ' - ' + str(tup[1]) + '\n',  sorted( filter(lambda tup: tup[0] not in open('../stop_words.txt').read().lower().split(','), reduce(lambda word_dict, word: word_dict if (word_dict.__setitem__(word, word_dict.get(word, 0) + 1) if True else None) else word_dict, filter(lambda word: len(word) > 1, (''.join(map(lambda letter: ' ' if ord(letter) not in list(range(ord('a'), ord('z') + 1)) else letter, open('../pride-and-prejudice.txt').read().lower()))).split()), {}).iteritems()), key=lambda tup: tup[1], reverse=True)[0:25], '')) # hole in one?
+print (reduce(lambda string, tup: string + tup[0] + ' - ' + str(tup[1]) + '\n', sorted( filter(lambda tup: tup[0] not in open(__import__('os').path.join(__import__('os').path.dirname(__file__), '..', 'stop_words.txt')).read().lower().split(','),  reduce(lambda word_dict, word: word_dict if (word_dict.__setitem__(word, word_dict.get(word, 0) + 1) if True else None) else word_dict, filter(lambda word: len(word) > 1, (''.join(map(lambda letter: ' ' if ord(letter) not in set(range(ord('a'), ord('z') + 1)) else letter, open(__import__('sys').argv[1]).read().lower()))).split()), {}).iteritems()), key=lambda tup: tup[1], reverse=True)[0:25], '')) # hole in one?