Feat_extract_task 2 - Takes the data and extracts the revisions, and
outputs a text file(pair_edits.txt) with edit pairs (deletion, followed
by addition). A total of 20,096 pairs. Classify.py- takes the
pair_edits.txt, and classifies spelling edits. Prints out the pre and
post correction word, and then, prints out a total count (spelling
corrections) and a subtotal count (capitalization corrections). The
results for that can be seen in classify_results1.txt