Close the stream after writing.
Merge pull request #816 from ycombinator/close-stream-to-cf

Close the stream after writing.
Update 2013-08-19-bookstore-for-ipython-notebooks.markdown
Modifying contents to reflect PRs should go against master branch
Merge pull request #825 from rdodev/kill-devblog-branch

Modifying contents to reflect PRs should go against master branch
Fixing busted redirect for digital marketing team
Merge pull request #826 from rackerlabs/speed

Fixing busted redirect for digital marketing team