[tlc] Add an extractor for tlc.com

It uses the same system as discovery.com

youtube_dl/extractor/tlc.py

@@ -4,6 +4,24 @@ import re
 
 from .common import InfoExtractor
 from .brightcove import BrightcoveIE
+from .discovery import DiscoveryIE
+
+
+class TlcIE(DiscoveryIE):
+    IE_NAME = 'tlc.com'
+    _VALID_URL = r'http://www\.tlc\.com\/[a-zA-Z0-9\-]*/[a-zA-Z0-9\-]*/videos/(?P<id>[a-zA-Z0-9\-]*)(.htm)?'
+
+    _TEST = {
+        'url': 'http://www.tlc.com/tv-shows/cake-boss/videos/too-big-to-fly.htm',
+        'md5': 'c4038f4a9b44d0b5d74caaa64ed2a01a',
+        'info_dict': {
+            'id': '853232',
+            'ext': 'mp4',
+            'title': 'Cake Boss: Too Big to Fly',
+            'description': 'Buddy has taken on a high flying task.',
+            'duration': 119,
+        },
+    }
 
 
 class TlcDeIE(InfoExtractor):