Solved all issues except #64, #69, #56 and #55
#69 - stem() should not be util.h. No idea where to put stem(). The only downside of not putting it in a header file is that the tests won't work. If we do not have direct access to stem(), we will have to call varnam_learn() and then see if the stemmed word was learned (by querying the db) to test the stemmer functionality.
#64 - make get_stem() more efficient.