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
[gamekings] Fix the test video checksum
Don't assume the 'subtitlesformat' is set in the params dict (fixes #1750)
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
[livestream] Add an extractor for the original version of livestream (closes #1764)

The two versions use different systems.
[soundlcoud] Set the correct extension for the tracks (fixes #1766)

Some tracks are not in mp3 format, they can be wav files.
[youtube] Fix protocol-independent URLs (Fixes #1768)
Merge branch 'master' of github.com:rg3/youtube-dl
release 2013.11.15
Pass the 'download' argument to 'process_video_result' (fixes #1769)
[youtube:channel] Fix the extraction of autogenerated channels

The ajax pages are empty, now it looks directly in the channel's /videos page
[tvp] Update the title and the description of the test video
Improve the OpenGraph regex

* Do not accept '>' between the property and content attributes.
* Recognize the properties if the content attribute is before the property attribute using two regexes (fixes the extraction of the description for SlideshareIE).
Don't accept '>' inside the content attribute in OpenGraph regexes
[rtlnow] Remove the test for nitro

The videos expire.