CLC-2908 Asset compilation fails because of Gemfile.lock updates. Revert...

... "CLC-2905 Updates Rails to 3.2.16, along with many other gems"

This reverts commit 2bea6cd92896302b6edc9b56bb1d81769c004364.

https://jira.media.berkeley.edu/jira/browse/CLC-2908