[WebSocket] Removed deprecated code

Removed some unused Frame code in favour of newer APIs
Removed RFC's Message::frame and Frame::create methods

Version/RFC6455.php

@@ -240,15 +240,6 @@ class RFC6455 implements VersionInterface {
         return new Frame($payload, $final, $opcode);
     }
 
-    /**
-     * @todo This is needed when a client is created - needs re-write as missing parts of protocol
-     * @param string
-     * @return string
-     */
-    public function frame($message, $mask = true) {
-        return $this->newFrame($message)->getContents();
-    }
-
     /**
      * Used when doing the handshake to encode the key, verifying client/server are speaking the same language
      * @param string

Version/RFC6455/Frame.php

@@ -62,19 +62,6 @@ class Frame implements FrameInterface {
         $this->addBuffer(static::encode($raw) . $payload);
     }
 
-    /**
-     * @param string A valid UTF-8 string to send over the wire
-     * @param bool Is the final frame in a message
-     * @param int The opcode of the frame, see constants
-     * @param bool Mask the payload
-     * @return Frame
-     * @throws InvalidArgumentException If the payload is not a valid UTF-8 string
-     * @throws LengthException If the payload is too big
-     */
-    public static function create($payload, $final = true, $opcode = 1) {
-        return new static($payload, $final, $opcode);
-    }
-
     /**
      * Encode the fake binary string to send over the wire
      * @param string of 1's and 0's