[Bigflix] Add new extractor for bigflix.com

Add an IE to support bigflix.com. It uses some sort of silverlight
plugin whose video url is being populated using base64 encoded
flashvars. So it is quite straightforward to extract.

youtube_dl/extractor/bigflix.py

@@ -0,0 +1,42 @@
+# coding: utf-8
+from __future__ import unicode_literals
+
+from base64 import b64decode
+
+from .common import InfoExtractor
+from ..compat import compat_urllib_parse_unquote
+
+
+class BigflixIE(InfoExtractor):
+    _VALID_URL = r'https?://(?:www\.)?bigflix\.com/.*/(?P<id>[0-9]+)'
+    _TEST = {
+        'url': 'http://www.bigflix.com/Hindi-movies/Action-movies/Singham-Returns/16537',
+        'md5': 'ec76aa9b1129e2e5b301a474e54fab74',
+        'info_dict': {
+            'id': '16537',
+            'ext': 'mp4',
+            'title': 'Singham Returns',
+            'description': 'md5:3d2ba5815f14911d5cc6a501ae0cf65d',
+        }
+    }
+
+    def _real_extract(self, url):
+        video_id = self._match_id(url)
+
+        webpage = self._download_webpage(url, video_id)
+
+        title = self._html_search_regex(
+            r'<div[^>]+class=["\']pagetitle["\'][^>]*>(.+?)</div>',
+            webpage, 'title')
+
+        video_url = b64decode(compat_urllib_parse_unquote(self._search_regex(
+            r'file=([^&]+)', webpage, 'video url')).encode('ascii')).decode('utf-8')
+
+        description = self._html_search_meta('description', webpage)
+
+        return {
+            'id': video_id,
+            'title': title,
+            'url': video_url,
+            'description': description,
+        }