add post processor
fix ffmpeg error, if youtube-dl runs more than once with --embed-thumbnail with same video
fix ffmpeg metadatapp
we don't need to run ffmpeg more times
[musicplayon] Add support for musicplayon.com
[cspan] Support multiple segments (Fixes #2674)
Detect Websense censorship (Fixes #2670)
release 2014.04.03
Only mention websense URL once
[franceculture] Add extractor (Fixes #2669)
release 2014.04.03.1
MANIFEST.in: Only list the files from the docs folder that will be included (closes #2623)

Pruning the _build folder produced the message `no previously-included directories found matching 'docs/_build'` when installing from the source distribution.
[downloader/f4m] Close the final video
[comedycentral:shows] Support guest/ URLs (Fixes #2677)
[YouTubeDL] Throw an early error if the info_dict result is invalid
[README] Improve developer instructions

Add a longer tutorial that should cover everything needed to start developing IEs.

Fixes #2676
[c56] Modernize and add duration extraction
[youtube:subscriptions] Add space to the description
Correct check for empty dirname (Fixes #2683)
release 2014.04.03.2