Add support for authentication http://www.gracieuniversity.com/

[marcelompz]

$ youtube-dl --verbose -u PRIVATE -p PRIVATE http://www.gracieuniversity.com/Players/FVLessonPlayer/FVLessonPlayer.aspx?enc=dkG2PaKrWHkbW%2bHxxa7%2bXA%3d%3d
[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: [u'--verbose', u'-u', u'PRIVATE', u'-p', u'PRIVATE', u'http://www.gracieuniversity.com/Players/FVLessonPlayer/FVLessonPlayer.aspx?enc=dkG2PaKrWHkbW%2bHxxa7%2bXA%3d%3d']
[debug] Encodings: locale UTF-8, fs UTF-8, out UTF-8, pref UTF-8
[debug] youtube-dl version 2017.02.24.1
[debug] Python version 2.7.6 - Linux-3.19.0-32-generic-x86_64-with-LinuxMint-17.3-rosa
[debug] exe versions: avconv 9.20-6, avprobe 9.20-6
[debug] Proxy map: {}
[generic] FVLessonPlayer: Requesting header
WARNING: Could not send HEAD request to http://www.gracieuniversity.com/Players/FVLessonPlayer/FVLessonPlayer.aspx?enc=dkG2PaKrWHkbW%2bHxxa7%2bXA%3d%3d: <urlopen error [Errno -2] Name or service not known>
[generic] FVLessonPlayer: Downloading webpage
ERROR: Unable to download webpage: <urlopen error [Errno -2] Name or service not known> (caused by URLError(gaierror(-2, 'Name or service not known'),))
File "/usr/local/bin/youtube-dl/youtube_dl/extractor/common.py", line 496, in _request_webpage
return self._downloader.urlopen(url_or_request)
File "/usr/local/bin/youtube-dl/youtube_dl/YoutubeDL.py", line 2093, in urlopen
return self._opener.open(req, timeout=self._socket_timeout)
File "/usr/lib/python2.7/urllib2.py", line 404, in open
response = self._open(req, data)
File "/usr/lib/python2.7/urllib2.py", line 422, in _open
'_open', req)
File "/usr/lib/python2.7/urllib2.py", line 382, in _call_chain
result = func(*args)
File "/usr/local/bin/youtube-dl/youtube_dl/utils.py", line 918, in http_open
req)
File "/usr/lib/python2.7/urllib2.py", line 1184, in do_open
raise URLError(err)

Hi, I'm downloaded the first video in the page, that's http://www.gracieuniversity.com/Players/FVLessonPlayer/FVLessonPlayer.aspx?enc=%2fd2ro7h1eDQMt9mN44fjzA%3d%3d
even without provide a user and password.