Upgrading from rails 4.0.2 to 4.0.3, to fix security issues:
http://weblog.rubyonrails.org/2014/2/18/Rails_3_2_17_4_0_3_and_4_1_0_beta2_have_been_released/

Note: I did bundle update, then hand-pruned the Gemfile.lock to only update the rails stuff.
fix for typeahead css for background color of selected item