reactjs/react-rails — pull request #40 by sickill (2014-04-11 12:59:32+00:00)
Title: Initialize railtie for all groups

Without `:group => :all` you can't `rake assets:precompile` when you
have `config.initialize_on_precompile = false`.

I'm not sure if there are any downsides for doing this but it seems to be working fine for us.