subtitle support,
option to add -map flag
tutorial
update tutorial for subtitle copy
Fix __repr__ when MediaFormatInfo().duration is None
update test with -sn option
fixed typo
fix error for wrong map format
cleanup
added FLAC Audio codec, DVB and DVD Subtitle Codecs
reordered codecs: video, audio, subtitle
Merge branch 'master' into development
README: fix incorrect syntax in the quickstart example

Thanks to Thijs Triemstra for reporting the problem.
Merge pull request #36 from senko/fix-quickstart-example

README: fix incorrect syntax in the quickstart example
Merge pull request #40 from tahajahangir/master

Fix __repr__ when MediaFormatInfo().duration is None
Merge pull request #33 from cytec/development

Development
fix ffmpeg for travis
Merge pull request #42 from cytec/development

fix ffmpeg for travis
Add a process pid when extiting with FFMpegConvertError.
Merge pull request #44 from KoleS46/master

Add a process pid when extiting with FFMpegConvertError.