Add mix-in for stopwords that are to be read from file
Add mix-in for stopwords that are to be read from file

StopWordsFromFileMixIn implements stop_words_map() for languages for which stop words list is being stored in an external file.

berkmancenter/mediacloud,berkmancenter/mediacloud,berkmancenter/mediacloud,berkmancenter/mediacloud,berkmancenter/mediacloud