Update Rails version to 4.1.4

http://weblog.rubyonrails.org/2014/7/2/Rails_3_2_19_4_0_7_and_4_1_3_have_been_released/
http://weblog.rubyonrails.org/2014/7/2/Rails_4_0_8_and_4_1_4_have_been_released/