Merge branch 'feature/send-response-listener' into develop

Close zendframework/zendframework#3105

src/Response.php

@@ -19,8 +19,18 @@
  */
 class Response extends Message implements ResponseInterface
 {
+
+    /**
+     * @var bool
+     */
     protected $contentSent = false;
 
+    /**
+     * Check if content was sent
+     *
+     * @return bool
+     * @deprecated
+     */
     public function contentSent()
     {
         return $this->contentSent;
@@ -48,6 +58,12 @@ public function getErrorLevel()
         return $this->getMetadata('errorLevel', 0);
     }
 
+    /**
+     * Send content
+     *
+     * @return Response
+     * @deprecated
+     */
     public function sendContent()
     {
         if ($this->contentSent()) {
@@ -58,10 +74,14 @@ public function sendContent()
         return $this;
     }
 
+    /**
+     * @deprecated
+     */
     public function send()
     {
         $this->sendContent();
         $errorLevel = (int) $this->getMetadata('errorLevel',0);
         exit($errorLevel);
     }
+
 }