Remove Express 3.x middleware error stubs

closes #3217

test/exports.js

@@ -50,12 +50,4 @@ describe('exports', function(){
     .get('/')
     .expect('bar', done);
   })
-
-  it('should throw on old middlewares', function(){
-    var error;
-    try { express.bodyParser; } catch (e) { error = e; }
-    should(error).have.property('message');
-    error.message.should.containEql('middleware');
-    error.message.should.containEql('bodyParser');
-  })
 })