removed unnecessary script
changed galenet author parser so it only retrieves authors which have atleast 1 first and last name. If there are more than 1 last names, we take the longest one. Added a utility function in util.string to get the longest string from a string list
added tests for table.author_article.get_last_name_count, table.author_article.name_bigram_present functions. Modified test suite to reflect those new tests.
added get_last_name_count function to author_articles module in table package. Modified name_bigram_present to pass all unit tests. Added script to get the author with a bigram presence and maximum last name count for each article.