Implementing 204 on delete and removing unnecessary steps

spec/test/features/control/delete/success.feature

@@ -10,5 +10,5 @@ Feature: Delete routes in Kapow! server.
       | GET    | /listRootDir       | /bin/sh -c | ls -la / \| response /body                       |
       | GET    | /listDir/{dirname} | /bin/sh -c | ls -la /request/params/dirname \| response /body |
     When I delete the first route
-    Then I get 200 as response code
-      And I get "OK" as response reason phrase
+    Then I get 204 as response code
+      And I get "No Content" as response reason phrase