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
Merge branch 'master' into rtmpdump

Conflicts:
	youtube_dl/FileDownloader.py

Merge
Move the opener to the YoutubeDL object.

This is the first step towards being able to just import youtube_dl and start using it.
Apart from removing global state, this would fix problems like #1805.
Log to an external logger (fixes #1810)

Sadly applications using youtube-dl's python sources can't directly
access it's log stream. It's pretty much limited to stdout and stderr
only.

It should log to logging.Logger instance passed to YoutubeDL's params
dictionary.
Add support for niconico
[streamcloud] skip test on travis
[brightcove] Set the 'videoPlayer' value to the 'videoId' if it's missing in the parameters (fixes #1815)
Merge remote-tracking branch 'iTaybb/master'
Simplify logger code(#1811)
Merge remote-tracking branch 'takuya0301/niconico'
[niconico] Simplify and make work with old Python versions

The website requires SSLv3, otherwise it just times out during SSL negotiation.
Credit @takuya0301 for niconico
[update] fix error
[bandcamp] Remove unused variable
[niconico] Clarify download
[youtube] do not use variable name twice
[viki] Add extractor (fixes #1813)
release 2013.11.24
[clipfish] Add extractor (Fixes #1760)