Add support for ligonier.org (was: ERROR: Unsupported URL:)

[garyb2000]

Here is the verbose output:

~$ youtube-dl --verbose http://www.ligonier.org/rym/broadcasts/video/why-god-man-june-2014/
[debug] System config: []
[debug] User config: []
[debug] Command-line args: ['--verbose', 'http://www.ligonier.org/rym/broadcasts/video/why-god-man-june-2014/']
[debug] Encodings: locale UTF-8, fs UTF-8, out UTF-8, pref UTF-8
[debug] youtube-dl version 2014.06.24.1
[debug] Python version 2.7.6 - Linux-3.13.0-29-generic-x86_64-with-Ubuntu-14.04-trusty
[debug] Proxy map: {}
[generic] why-god-man-june-2014: Requesting header
WARNING: Falling back on generic information extractor.
[generic] why-god-man-june-2014: Downloading webpage
[generic] why-god-man-june-2014: Extracting information
ERROR: Unsupported URL: http://www.ligonier.org/rym/broadcasts/video/why-god-man-june-2014/; please report this issue on https://yt-dl.org/bug . Be sure to call youtube-dl with the --verbose flag and include its complete output. Make sure you are using the latest version; type youtube-dl -U to update.
Traceback (most recent call last):
File "/usr/local/bin/youtube-dl/youtube_dl/extractor/generic.py", line 451, in _real_extract
doc = parse_xml(webpage)
File "/usr/local/bin/youtube-dl/youtube_dl/utils.py", line 1406, in parse_xml
return xml.etree.ElementTree.XML(s.encode('utf-8'), **kwargs)
File "/usr/lib/python2.7/xml/etree/ElementTree.py", line 1300, in XML
parser.feed(text)
File "/usr/lib/python2.7/xml/etree/ElementTree.py", line 1642, in feed
self._raiseerror(v)
File "/usr/lib/python2.7/xml/etree/ElementTree.py", line 1506, in _raiseerror
raise err
ParseError: mismatched tag: line 196, column 2
Traceback (most recent call last):
File "/usr/local/bin/youtube-dl/youtube_dl/YoutubeDL.py", line 516, in extract_info
ie_result = ie.extract(url)
File "/usr/local/bin/youtube-dl/youtube_dl/extractor/common.py", line 167, in extract
return self._real_extract(url)
File "/usr/local/bin/youtube-dl/youtube_dl/extractor/generic.py", line 741, in _real_extract
raise ExtractorError('Unsupported URL: %s' % url)
ExtractorError: Unsupported URL: http://www.ligonier.org/rym/broadcasts/video/why-god-man-june-2014/; please report this issue on https://yt-dl.org/bug . Be sure to call youtube-dl with the --verbose flag and include its complete output. Make sure you are using the latest version; type youtube-dl -U to update.