add support for bloomberg.com

[Siddhant]

youtube-dl --verbose http://www.bloomberg.com/news/articles/2015-11-12/five-strange-things-that-have-been-happening-in-financial-markets
[debug] System config: []
[debug] User config: []
[debug] Command-line args: [u'--verbose', u'http://www.bloomberg.com/news/articles/2015-11-12/five-strange-things-that-have-been-happening-in-financial-markets']
[debug] Encodings: locale UTF-8, fs UTF-8, out UTF-8, pref UTF-8
[debug] youtube-dl version 2015.11.15
[debug] Python version 2.7.10 - CYGWIN_NT-6.1-WOW-2.2.1-0.289-5-3-i686-32bit
[debug] exe versions: none
[debug] Proxy map: {REDACTED}
[generic] five-strange-things-that-have-been-happening-in-financial-markets: Requesting header
WARNING: Falling back on generic information extractor.
[generic] five-strange-things-that-have-been-happening-in-financial-markets: Downloading webpage
[generic] five-strange-things-that-have-been-happening-in-financial-markets: Extracting information
ERROR: Unsupported URL: http://www.bloomberg.com/news/articles/2015-11-12/five-strange-things-that-have-been-happening-in-financial-markets
Traceback (most recent call last):
  File "/usr/lib/python2.7/site-packages/youtube_dl/extractor/generic.py", line 1255, in _real_extract
    doc = compat_etree_fromstring(webpage.encode('utf-8'))
  File "/usr/lib/python2.7/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 "/usr/lib/python2.7/site-packages/youtube_dl/compat.py", line 237, 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: not well-formed (invalid token): line 3, column 584
Traceback (most recent call last):
  File "/usr/lib/python2.7/site-packages/youtube_dl/YoutubeDL.py", line 661, in extract_info
    ie_result = ie.extract(url)
  File "/usr/lib/python2.7/site-packages/youtube_dl/extractor/common.py", line 290, in extract
    return self._real_extract(url)
  File "/usr/lib/python2.7/site-packages/youtube_dl/extractor/generic.py", line 1858, in _real_extract
    raise UnsupportedError(url)
UnsupportedError: Unsupported URL: http://www.bloomberg.com/news/articles/2015-11-12/five-strange-things-that-have-been-happening-in-financial-marke