Fix Ruby 1.8.7 warning about regex syntax.

Noticed this when running against Ruby 1.8.7, there were two repeated
warnings based on improper escaped brackets:

- spec/rspec/rails/matchers/route_to_spec.rb:114:
  > warning: regexp has invalid interval

- spec/rspec/rails/matchers/route_to_spec.rb:114:
  > warning: regexp has `}' without escape

Author: cupakromer

spec/rspec/rails/matchers/route_to_spec.rb

@@ -109,9 +109,9 @@ def assert_recognizes(*)
   context "with should_not" do
     context "when assert_recognizes passes" do
       it "fails with custom message" do
-        expect do
+        expect{
           expect({:get => "path"}).not_to route_to("these" => "options")
-        end.to raise_error(/expected {:get=>"path"} not to route to {"these"=>"options"}/)
+        }.to raise_error(/expected \{:get=>"path"\} not to route to \{"these"=>"options"\}/)
       end
     end