Merge pull request #3 from columbia-applied-data-science/more-adds

More adds
BUG: Added dspy to setup
added topic_seek to workflow
added bigram tokenizers to nlp
added nlp tests to text
minor cleanup of nlp
added a word_tok option to bigram_tok
UP: Put she-bangs in the cmd tools
Merge branch 'master' of https://github.com/columbia-applied-data-science/dspy
updated setup
updated setup
UP: Before trying to get pip right
Merge branch 'master' into more-adds
added api.py to text
Added to scripts
Merge branch 'master' into more-adds
UP: Before switching to printing doc_freq
UP: Worked through vw_helpers.md