extractor: youtube: Swap video dimensions to match standard practice.

While working on this, I thought about simplifying things like changing
480x854 to 480p, and that seemed like a good option, until I realized that
people (me included) usually link the concept of some number followed by a p
with the video being 16:9.

So, we would be losing some information and, as we all know,
[explicit is better than implicit][*].

[*]: http://www.python.org/dev/peps/pep-0020/

This closes #1446.

Signed-off-by: Rogério Brito <rbrito@ime.usp.br>
Report download progress of rtmpdump
Add support for d8.tv
[youtube:playlist] Don't use the gdata api (closes #1508)

Parse the playlist pages instead
[youtube:playlist] Login into youtube if requested (fixes #1757)

Allows to download private playlists
Fix filename extension leaking to json filename

Makes writeinfojson behaving exactly as writethumbnail in case where filename contains mediafile extension.

Case:

video.mp4 converted to music.mp3 would yield music.mp4.info.json instead music.mp3.info.json or music.info.json
Update test_write_info_json.py
Fix indentation of (best) and (worst) in --list-formats
[dailymotion] Fix playlists
[bambuser] Do not test for MD5, seems to be flaky
[tvp] Skip tests
[gamekings] remove unnecessary import
[gamekings] Do not test md5 sum, precise file changes regularly
[redtube] Do not test md5, seems to vary
Add support for anitube.se (#1417)
[arte] remove two typos
[youtube] Add view_count (Fixes #1781)
Move console_title to YoutubeDL
Remove * imports
[SouthParkStudiosIE] Also detect urls without http:// or www