Feature/#274 (#281)

* #274 added acceptance tests, need to work out failing unit tests but probably going to be a redesign where we hold a reference to the cookie container and empty it if needed

* #274 updated code coverage value

* #274 offloaded cache logic to builder in preparation for adding state

* #274 hacked something together but this is not right approach

* #274 updated defaults and docs

* #274 updated code coverage

test/Ocelot.AcceptanceTests/Steps.cs

@@ -274,6 +274,11 @@ namespace Ocelot.AcceptanceTests
             _ocelotClient = _ocelotServer.CreateClient();
         }
 
+        internal void GivenIAddCookieToMyRequest(string cookie)
+        {
+            _ocelotClient.DefaultRequestHeaders.Add("Set-Cookie", cookie);
+        }
+
         /// <summary>
         /// This is annoying cos it should be in the constructor but we need to set up the file before calling startup so its a step.
         /// </summary>