don't overwrite the request

lib/zero/controller.rb

@@ -7,7 +7,7 @@ module Zero
   class Controller
     # initialize a new instance of the controller and call response on it
     def self.call(env)
-      new(Zero::Request.new(env)).response
+      new(Zero::Request.create(env)).response
     end
 
     # set the renderer to use in the controller

spec/unit/controller/call_spec.rb

@@ -11,4 +11,12 @@ describe Zero::Controller, '.call' do
   it "returns an object with the first element being a status" do
     subject[0].should be_kind_of(Numeric)
   end
+
+  it "does not modify an existing request" do
+    r = Zero::Request.new(env)
+    r.params['foo'] = 'bar'
+    subject
+    r = Zero::Request.create(env)
+    expect(r.params['foo']).to eq('bar')
+  end
 end