fix rails Gem::Dependency#version_requirements warning
fix rails Gem::Dependency#version_requirements warning

A deprecation warning is printed when running spec or cucumber tests:

  rails/gem_dependency.rb:119:Warning:
  Gem::Dependency#version_requirements is deprecated and will 
  be removed on or after August 2010.  Use #requirement

This patch fixes that warning. 

See:
https://rails.lighthouseapp.com/projects/8994/tickets/4026-rubygems-136-warning-in-rails-235
http://github.com/rails/rails/commit/268c9040d5c3c7ed30f3923eee71a78eeece8a8a
concord-consortium/rigse,concord-consortium/rigse,concord-consortium/rigse,concord-consortium/rigse,concord-consortium/rigse,concord-consortium/rigse