Chapter4.ipynb
* 4.1 - people_feed
* 4.2 - added display names
* 4.3,5 - Re-enter your API_KEY from  https://code.google.com/apis/console if not currently set

bootstrap.sh
* 4.6+ - downloads nltk stopwords
* Running IPython notebook as vagrant user (vs root) so fs writes can be read
Merge pull request #31 from jwsy/master

Chapter 4 fixes. Thanks @jwsy!