Update ruby to 2.1.2
Merge pull request #123 from matteodepalo/ruby-2.1.2

Update ruby to 2.1.2
Update travis.yml
Merge pull request #124 from matteodepalo/ruby-2.1.2

Update travis.yml
Update Rails to 3.2.18

See http://weblog.rubyonrails.org/2014/5/6/Rails_3_2_18_4_0_5_and_4_1_1_have_been_released/