Revert "[sexykarma] Remove the extractor"

This reverts commit 31ff3c074e.

youtube_dl/extractor/extractors.py

@@ -657,6 +657,7 @@
 from .senateisvp import SenateISVPIE
 from .servingsys import ServingSysIE
 from .sexu import SexuIE
+from .sexykarma import SexyKarmaIE
 from .shahid import ShahidIE
 from .shared import SharedIE
 from .sharesix import ShareSixIE