Fix railtie.rb for Rails 4.1

See https://github.com/rails/rails/pull/13271 for an explanation why the return statements in before_initialize and the initializer block cause errors. I am not sure why this did not show in #37. While it seems not to occur in Ruby 1.8.7, I'd expect it in 1.9.3.

In any case, this change fixes the (non-test) start of my application with Rails 4.1.0.beta1 and Ruby 2.1.