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>
[tvp] Telewizja Polska: new extractor for tvp.pl, fixes #1719

Thanks-To: mplonski

https://github.com/mplonski/linux/blob/master/tvp-dl.py
Report download progress of rtmpdump
Clarify -c. Do not pass it in if you don't know what you're doing

Suggested in #1743
release 2013.11.11
[common] Simplify og_search_property
FFmpegMetadataPP: don't enclose the values with " (fixes #1756)
[vine] Fix uploader extraction
Add support for d8.tv
Add extractor for gamekings.tv
[gamekings] Minor fixes (#1759)
Credit @jelly for gamekings extractor (#1759)
Merge remote-tracking branch 'saper/tvp'
[tvp] Minor improvements (#1730)
Credit @saper for tvp IE (#1730)
release 2013.11.13
[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)