ArteTVIE: support emission urls that don't contain the video id

Like http://www.arte.tv/guide/fr/emissions/AJT/arte-journal
Dailymotion: fix the download of the video in the max quality (closes #986)
DailymotionIE: simplify the extraction of the title and remove an unused assignment of video_uploader
release 2013.07.05
DailymotionIE: extract thumbnail
Add BrightcoveIE (closes #832)

It only accepts the urls that are use for embedding the video, it doesn't search in generic webpages to find Brightcove videos
[youtube] Add and extractor for the subscriptions feed (closes #498)

It can be downloaded using the ytsubscriptions keyword.
It needs the login information.
release 2013.07.07
[youtube:subscriptions] Use colon for differentiation of shortcuts
release 2013.07.07.01
YoutubeIE: extract the thumbnail in the best possible quality
VimeoIE: authentication support (closes #885) and add a method in the base InfoExtractor to get the login info
[3sat] Add support (Fixes #1001)
Merge branch 'master' of github.com:rg3/youtube-dl
[arte] Always look for the JSON URL (Fixes #1002)
release 2013.07.08
[archive.org] Add extractor (Fixes #1003)
release 2013.07.08.1
Do not redefine variables in list comprehensions
Remove dead code