Move Vagrantfile to root directory
Add chef recipe
Remove bash provision script
Merge remote-tracking branch 'upstream/master'
Use pip editable
Update Chapter9.ipynb

oauth_login needs to return a twitter_api obj
Merge pull request #45 from jwsy/patch-4

Update Chapter9.ipynb (oauth_login needs to return a twitter_api obj). Thanks @jwsy!
Fixes #47
Fixes #46
Minor formatting/language updates

Also expanded an example in Chapter9 to be more illustrative
Renaming notebooks to mirror the book's TOC.
Renaming resources folder to be consistent with notebook name
Fixing links in README to read-only ipynb viewer

Also added missing file (Chapter 9) from last commit
Formatting updates to README
Formatting updates to README
Formatting updates to README
Minor updates to README
Fixing typo in filename
Updated preface notebook
Fixed header in Appendix C