gettext_i18n_rails 1.0.0 was released on Sept 30th, which requires gettext 3.0.2 or higher.

https://github.com/grosser/gettext_i18n_rails/commit/d1b02f734f9e0c96de50d1a58e8170ce6ec457ac
https://github.com/grosser/gettext_i18n_rails/commit/6c83ce9255122ddb0c28ec5ca96e5a1975a8e0c8

Via #3005, we've restricted gettext to 2.x to retain Ruby 1.8 compatibility, so we also need to pin gettext_i18n_rails to ~> 0.8.

no such file to load -- gettext/tools/task
/usr/local/rvm/gems/ruby-1.8.7-p371@test_develop_pull_request-2/gems/activesupport-3.2.14/lib/active_support/dependencies.rb:251:in `require'
/usr/local/rvm/gems/ruby-1.8.7-p371@test_develop_pull_request-2/gems/activesupport-3.2.14/lib/active_support/dependencies.rb:251:in `require'
/usr/local/rvm/gems/ruby-1.8.7-p371@test_develop_pull_request-2/gems/activesupport-3.2.14/lib/active_support/dependencies.rb:236:in `load_dependency'
/usr/local/rvm/gems/ruby-1.8.7-p371@test_develop_pull_request-2/gems/activesupport-3.2.14/lib/active_support/dependencies.rb:251:in `require'
/usr/local/rvm/gems/ruby-1.8.7-p371@test_develop_pull_request-2/gems/gettext_i18n_rails-1.0.0/lib/gettext_i18n_rails/tasks.rb:1