Ported specs for nlp#message
Moved specs into the Nickel modules, so nickel classes don't need
namespacing
Made run_specs.sh output ruby warnings
Removed unused attributes

Found through ruby warnings
Corrected uneven indentation
Configured rspec to ignore tests tagged with "broken"
Ported specs for nlp#occurrences

Also refactored nlp_spec in general
Removed test unit