Spring2014 minimal update to 3218

- devel_update branch was created off of develop; this has fewer changes.
- includes pull request https://github.com/saasbook/rag/pull/33 "Log dir" 
- includes pull request https://github.com/saasbook/rag/pull/35 "hw_updates_hw4_grader_stuff"
- updated Gemfile with rails 3.2.18 and re-added therubyracer
- bundle update => new Gemfile.lock