[slashdot] Remove extractor

The generic ooyala detection works fine.

youtube_dl/extractor/__init__.py

@@ -208,7 +208,6 @@
 from .savefrom import SaveFromIE
 from .servingsys import ServingSysIE
 from .sina import SinaIE
-from .slashdot import SlashdotIE
 from .slideshare import SlideshareIE
 from .smotri import (
     SmotriIE,

youtube_dl/extractor/slashdot.py

@@ -1,24 +0,0 @@
-import re
-
-from .common import InfoExtractor
-
-
-class SlashdotIE(InfoExtractor):
-    _VALID_URL = r'https?://tv\.slashdot\.org/video/\?embed=(?P<id>.*?)(&|$)'
-
-    _TEST = {
-        u'add_ie': ['Ooyala'],
-        u'url': u'http://tv.slashdot.org/video/?embed=JscHMzZDplD0p-yNLOzTfzC3Q3xzJaUz',
-        u'file': u'JscHMzZDplD0p-yNLOzTfzC3Q3xzJaUz.mp4',
-        u'md5': u'd2222e7a4a4c1541b3e0cf732fb26735',
-        u'info_dict': {
-            u'title': u' Meet the Stampede Supercomputing Cluster\'s Administrator',
-        },
-    }
-
-    def _real_extract(self, url):
-        mobj = re.match(self._VALID_URL, url)
-        video_id = mobj.group('id')
-        webpage = self._download_webpage(url, video_id)
-        ooyala_url = self._search_regex(r'<script src="(.*?)"', webpage, 'ooyala url')
-        return self.url_result(ooyala_url, 'Ooyala')