Add missing step in OpenShift docs

Fixes #303.
Merge pull request #304 from Koronen/openshift-gemfile-lock

Add missing step in OpenShift docs
Merge branch 'master' of git://github.com/swanson/stringer into tweak
Filter out unprintable characters in StoryRepository#sanitize, fixes #295
Merge branch 'master' of git://github.com/swanson/stringer into tweak