-- Used a lemmatization tool to convert all words stored as Term
   values into their base form. Hence, the changes from the previous
   commit that introduce a word-stemmer are no longer needed.
-- Erased possessive pronouns from term values because the context
   of the sentences from which they came is lost.
-- Moved the EnvironmentParser class into its own file.

Signed off by: Mark Farrell<markfarr2011@gmail.com>