Update redtube extractor (make title regex match current site)
diff --git a/youtube_dl/extractor/redtube.py b/youtube_dl/extractor/redtube.py
index b1bde1e8117..deb3ad52cac 100644
--- a/youtube_dl/extractor/redtube.py
+++ b/youtube_dl/extractor/redtube.py
@@ -57,7 +57,7 @@ def _real_extract(self, url):
 
         if not info.get('title'):
             info['title'] = self._html_search_regex(
-                (r'<h(\d)[^>]+class="(?:video_title_text|videoTitle)[^"]*">(?P<title>(?:(?!\1).)+)</h\1>',
+                (r'<h(\d)[^>]+class="(?:video_title_text|videoTitle|video_title)[^"]*">(?P<title>(?:(?!\1).)+)</h\1>',
                  r'(?:videoTitle|title)\s*:\s*(["\'])(?P<title>(?:(?!\1).)+)\1',),
                 webpage, 'title', group='title',
                 default=None) or self._og_search_title(webpage)

### Before submitting a *pull request* make sure you have:
- [ ] At least skimmed through [adding new extractor tutorial](https://github.com/ytdl-org/youtube-dl#adding-support-for-a-new-site) and [youtube-dl coding conventions](https://github.com/ytdl-org/youtube-dl#youtube-dl-coding-conventions) sections
- [x] [Searched](https://github.com/ytdl-org/youtube-dl/search?q=is%3Apr&type=Issues) the bugtracker for similar pull requests
- [ ] Checked the code with [flake8](https://pypi.python.org/pypi/flake8)

### In order to be accepted and merged into youtube-dl each piece of code must be in public domain or released under [Unlicense](http://unlicense.org/). Check one of the following options:
- [x] I am the original author of this code and I am willing to release it under [Unlicense](http://unlicense.org/)
- [ ] I am not the original author of this code but it is in public domain or released under [Unlicense](http://unlicense.org/) (provide reliable evidence)

### What is the purpose of your *pull request*?
- [x] Bug fix
- [ ] Improvement
- [ ] New extractor
- [ ] New feature

---

### Description of your *pull request* and other information

A site changed the html they use for the "title", so I updated the regex in the extractor to match.
