[bbc.co.uk] Improve overall extractor structure, add subtitles support
(#2184)

Everything from http://www.bbc.co.uk/iplayer/ should be downloadable
now.
[bbc.co.uk] Fix TV episode test
Add an extractor for syfy.com

It uses theplatfrom.com, which has been updated to work with f4m manifests
Add a downloader for f4m manifests
[kontrtube] Add support for kontrtube.ru (Closes #2354)
[bloomberg] Fix extraction of ooyala embed code
[slideshare] Fix description extraction and modernize

The ‘og:description’  property doesn’t contain the full description
[youtube] Correct invalid JSON (Fixes #2353)
Fix #2355 (date parsing with dashes)
[StreamCZ] Add support for stream.cz
[youtube] Correct a minor regex typo
release 2014.02.10
[brightcove] Unescape html entities from the 'og:video' url property (fixes #2360)
[lifenews] Minor improvements
[firsttv] Add support for 1tv.ru videoarchive
[firsttv] Fix video URL regex
[instagram] Modernize
[googleplus] Modernize and simplify
[howcast] Modernize
[breakcom] Modernize