Stripped out logging
Removed NLP#use_date_correction

Apparently legacy. Let's simplify the code
Removed debug code in the initializer of construct_finder
Renamed query.rb and query_constants.rb to nlp_query.rb and
nlp_query_constants.rb to reflect the class names contained
Tidied up require statements in nickel.rb
Removed copyright notices from the top of all files and moved it to the readme