kijiproject.github.com: DOCS-158. Update the docs to reflect the use of the express python script

issue: https://jira.kiji.org/browse/DOCS-158
review: https://review.kiji.org/r/1719
commit: https://github.com/kijiproject/kijiproject.github.com/commit/a11e4d83ad4ed271d041dad0ce2d6c96a38e800b