[ubu] Remove extractor

1. Videos on ubu.com are now hosted on Vimeo
2. The duration is far from correct, and may not exist on other videos
   (For example http://ubu.com/film/hammons_king.html)

youtube_dl/extractor/extractors.py

@@ -833,7 +833,6 @@
     TwitterIE,
     TwitterAmplifyIE,
 )
-from .ubu import UbuIE
 from .udemy import (
     UdemyIE,
     UdemyCourseIE

youtube_dl/extractor/ubu.py

@@ -1,57 +0,0 @@
-from __future__ import unicode_literals
-
-import re
-
-from .common import InfoExtractor
-from ..utils import (
-    int_or_none,
-    qualities,
-)
-
-
-class UbuIE(InfoExtractor):
-    _VALID_URL = r'https?://(?:www\.)?ubu\.com/film/(?P<id>[\da-z_-]+)\.html'
-    _TEST = {
-        'url': 'http://ubu.com/film/her_noise.html',
-        'md5': '138d5652618bf0f03878978db9bef1ee',
-        'info_dict': {
-            'id': 'her_noise',
-            'ext': 'm4v',
-            'title': 'Her Noise - The Making Of (2007)',
-            'duration': 3600,
-        },
-    }
-
-    def _real_extract(self, url):
-        video_id = self._match_id(url)
-        webpage = self._download_webpage(url, video_id)
-
-        title = self._html_search_regex(
-            r'<title>.+?Film &amp; Video: ([^<]+)</title>', webpage, 'title')
-
-        duration = int_or_none(self._html_search_regex(
-            r'Duration: (\d+) minutes', webpage, 'duration', fatal=False),
-            invscale=60)
-
-        formats = []
-        FORMAT_REGEXES = [
-            ('sq', r"'flashvars'\s*,\s*'file=([^']+)'"),
-            ('hq', r'href="(http://ubumexico\.centro\.org\.mx/video/[^"]+)"'),
-        ]
-        preference = qualities([fid for fid, _ in FORMAT_REGEXES])
-        for format_id, format_regex in FORMAT_REGEXES:
-            m = re.search(format_regex, webpage)
-            if m:
-                formats.append({
-                    'url': m.group(1),
-                    'format_id': format_id,
-                    'preference': preference(format_id),
-                })
-        self._sort_formats(formats)
-
-        return {
-            'id': video_id,
-            'title': title,
-            'duration': duration,
-            'formats': formats,
-        }