require rspec-rails 3.0

Conflicts:
	enju_circulation.gemspec
	spec/controllers/checkouts_controller_spec.rb
	spec/models/manifestation_checkout_stat_spec.rb
	spec/models/manifestation_reserve_stat_spec.rb
	spec/models/reserve_spec.rb
	spec/models/user_checkout_stat_spec.rb
	spec/models/user_reserve_stat_spec.rb
	spec/spec_helper.rb