--format='bestvideo+bestaudio': temporary files are not removed

[Nikoli]

I think temporary files should be removed by default:

$ youtube-dl --format='bestvideo+bestaudio' https://www.youtube.com/watch?v=MjQG1s3Isgg
[youtube] Setting language
[youtube] MjQG1s3Isgg: Downloading webpage
[youtube] MjQG1s3Isgg: Downloading video info webpage
[youtube] MjQG1s3Isgg: Extracting video information
[download] Destination: Сухой Т-50 ПАК ФА МАКС 2013 солнечно Sukhoi T-50 PAK FA MAKS 2013 sunny-MjQG1s3Isgg.f137.mp4
[download] 100% of 230.31MiB in 00:25
[download] Destination: Сухой Т-50 ПАК ФА МАКС 2013 солнечно Sukhoi T-50 PAK FA MAKS 2013 sunny-MjQG1s3Isgg.f140.m4a
[download] 100% of 12.87MiB in 00:01
[ffmpeg] Merging formats into "Сухой Т-50 ПАК ФА МАКС 2013 солнечно Sukhoi T-50 PAK FA MAKS 2013 sunny-MjQG1s3Isgg.mp4"
$ ls
Сухой Т-50 ПАК ФА МАКС 2013 солнечно Sukhoi T-50 PAK FA MAKS 2013 sunny-MjQG1s3Isgg.f137.mp4  Сухой Т-50 ПАК ФА МАКС 2013 солнечно Sukhoi T-50 PAK FA MAKS 2013 sunny-MjQG1s3Isgg.mp4
Сухой Т-50 ПАК ФА МАКС 2013 солнечно Sukhoi T-50 PAK FA MAKS 2013 sunny-MjQG1s3Isgg.f140.m4a
$ youtube-dl --version
2014.05.05

[jaimeMF]

Duplicate of #2108, hopefully it will be implemented some day.