Minor tweaks to align code with discussion in the text
smoothing out mismatched titles with text of book
fixed comment that was too long
Fixed error in D3 JS for visualizing interactions in matrix. Added code to serve up the visualization as an inline frame
Updating bootstrap.sh to download NLTK ancillary packages. Updating chapters 4 and 5 with inline frames for visualizations
Simplifications to chapters 2-3 by using IPython Notebook's ability to serve local files instead of using Flask. Now, no content in the main chapters relies on Flask and the rather complex flow that came along with it to serve content. All of that is now in Appendix B
Updating notebook captions to better match text
Updating welcome notebook with some context about executing cells in turn