Accept any character except `/` for uploader and the name, caused problems with non ASCII characters
Update __init__.py `io` wasn't imported.
Some of the videos are encrypted, the f4m downloader doesn’t support them.
enumerate
All the playlists return 500 errors.
[YT] Fix incorrect format code descriptions
Corrects the descriptions for the DASH video format codes 264 and 138 (1440p and 2160p, respectively).
Now we download over http, we don't need rtmpdump.
The courses seems to be no longer available, changed the test to a playlist.
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Attributes' order in <li> is arbitrary and changes every time playlist page is fetched, so we can't rely on `data-index` to be before `data-video-username`.
I passed `’webpage’` instead of the variable `webpage`.
From [their ToS](http://videobam.com/terms): "User must be eighteen 18[sic] years of age or older to use or access this web site."