Update rails 4.0.2 -> 4.0.3

This update contains some important security updates. More info can be
found at:

  http://weblog.rubyonrails.org/2014/2/18/Rails_3_2_17_4_0_3_and_4_1_0_beta2_have_been_released/

Change-Id: I05e9c7d71fe4d8bf3a908bda9deb6abbcef4624e