added association table for modifier
added method to return a lexical noun's node
changed association to be 1-way, and setting lexical-safe flag
code to include lexical noun choice
changed criteria for association
bug fixes & more atoms for testing lexical noun
included basic README for lexical noun choice
added more documentation and some cleanups
Merge pull request #1139 from williampma/microplanning

Microplanning: basic lexical noun choice