Add random text generation
Extend ngrams to any n, rather than just n = 2
Allow model to read different files
Added implicit 
 and 
 tags to input
Update README.md
Restructure ngram-model code into class
cleanup file
Merge branch 'ngrams' of https://github.com/wboag/Scheme-NLP into ngrams

Conflicts:
	README.md
Abstract tokenization prodedure
Allow ngrams module to be used by other programs
Merge branch 'ngrams'

Conflicts:
	README.md
resolving merge conflicts