kijiproject.github.com: DOCS-146. Fix Scoring user guide gists

issue: https://jira.kiji.org/browse/DOCS-146
review: https://review.kiji.org/r/1477
commit: https://github.com/kijiproject/kijiproject.github.com/commit/8ac4f7f78aae5054089d9abfd438c5cae362d033