please add support for rte.ie/archives

[clampak]

http://www.rte.ie/archives/2016/0210/766882-beat-of-the-feet/

$ youtube-dl http://www.rte.ie/archives/2016/0210/766882-beat-of-the-feet/ -v
[debug] System config: []
[debug] User config: []
[debug] Command-line args: [u'http://www.rte.ie/archives/2016/0210/766882-beat-of-the-feet/', u'-v']
[debug] Encodings: locale cp1252, fs mbcs, out None, pref cp1252
[debug] youtube-dl version 2016.02.10
[debug] Python version 2.7.11 - Windows-XP-5.1.2600-SP3
[debug] exe versions: ffmpeg N-78067-g9079e99, ffprobe N-78067-g9079e99, rtmpdump 2.4
[debug] Proxy map: {}
[generic] 766882-beat-of-the-feet: Requesting header
WARNING: Falling back on generic information extractor.
[generic] 766882-beat-of-the-feet: Downloading webpage
[generic] 766882-beat-of-the-feet: Extracting information
ERROR: Unsupported URL: http://www.rte.ie/archives/2016/0210/766882-beat-of-the-feet/
Traceback (most recent call last):
  File "c:\python27\lib\site-packages\youtube_dl\extractor\generic.py", line 1294, in _real_extract
    doc = compat_etree_fromstring(webpage.encode('utf-8'))
  File "c:\python27\lib\site-packages\youtube_dl\compat.py", line 248, in compat_etree_fromstring
    doc = _XML(text, parser=etree.XMLParser(target=etree.TreeBuilder(element_factory=_element_factory)))
  File "c:\python27\lib\site-packages\youtube_dl\compat.py", line 237, in _XML
    parser.feed(text)
  File "c:\python27\lib\xml\etree\ElementTree.py", line 1642, in feed
    self._raiseerror(v)
  File "c:\python27\lib\xml\etree\ElementTree.py", line 1506, in _raiseerror
    raise err
ParseError: undefined entity: line 8, column 13
Traceback (most recent call last):
  File "c:\python27\lib\site-packages\youtube_dl\YoutubeDL.py", line 666, in extract_info
    ie_result = ie.extract(url)
  File "c:\python27\lib\site-packages\youtube_dl\extractor\common.py", line 315, in extract
    return self._real_extract(url)
  File "c:\python27\lib\site-packages\youtube_dl\extractor\generic.py", line 1930, in _real_extract
    raise UnsupportedError(url)
UnsupportedError: Unsupported URL: http://www.rte.ie/archives/2016/0210/766882-beat-of-the-feet/