[camwithher] Add extractor

Corrected unnecessary test

Sane variable naming

RTMP all .flv & url_id for _download_webpage()

Corrected all outstanding issues, next up is a squash!

youtube_dl/extractor/__init__.py

@@ -95,6 +95,7 @@ from .camdemy import (
     CamdemyIE,
     CamdemyFolderIE
 )
+from .camwithher import CamWithHerIE
 from .canalplus import CanalplusIE
 from .canalc2 import Canalc2IE
 from .canvas import CanvasIE