Add an extractor for tv.slashdot.org (closes #1192)

It uses the ooyala platform, so it just extracts the ooyala url.

youtube_dl/extractor/__init__.py

@@ -58,6 +58,7 @@ from .ringtv import RingTVIE
 from .roxwel import RoxwelIE
 from .rtlnow import RTLnowIE
 from .sina import SinaIE
+from .slashdot import SlashdotIE
 from .soundcloud import SoundcloudIE, SoundcloudSetIE
 from .spiegel import SpiegelIE
 from .stanfordoc import StanfordOpenClassroomIE

youtube_dl/extractor/slashdot.py

@@ -0,0 +1,23 @@
+import re
+
+from .common import InfoExtractor
+
+
+class SlashdotIE(InfoExtractor):
+    _VALID_URL = r'https?://tv.slashdot.org/video/\?embed=(?P<id>.*?)(&|$)'
+
+    _TEST = {
+        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')