Revert "Merge pull request #86 from seandunn/42198561_update_rails_to_3.0.19"

This reverts commit 447e786c2372bd78afc08768522de19e880dc8e9, reversing
changes made to 76da4164449ef91a2c32f5120aefd8d1732ed559.
Updates Rails (only) to 3.0.19
Merge pull request #87 from seandunn/42198561_revert_gems_other_than_rails

42198561 revert gems other than rails