[fc2] Add new extractor (Fixes #2877)

This commit has been recreated, since there seems to have been a problem with GitHub; the PR doesn't have a branch.

youtube_dl/extractor/__init__.py

@@ -79,6 +79,7 @@ from .exfm import ExfmIE
 from .extremetube import ExtremeTubeIE
 from .facebook import FacebookIE
 from .faz import FazIE
+from .fc2 import FC2IE
 from .firstpost import FirstpostIE
 from .firsttv import FirstTVIE
 from .fivemin import FiveMinIE