Issue #103 Change-Id: I67945c8ec6d2c178494d3b5400e5ec0170e9d115
For mp4 outputs, a metadata box with version information is added to moov box. For mpd outputs, a text comment with version information is added in the beginning of mpd file. Issue #60 Change-Id: I783ba370781c0a8f77c910ff1172bad2e7edff75