release 4.1.2

update sidx and tfdt boxes to handle version 1 uint64 long times

release 4.1.1

fixed box-concat bug in parse

Update README.md

updated readme

release 4.1.0

updated internal api of parse modules, they have parse and build methods

updated readme

release 4.0.0

separate parser from builder, which is a new feature to come

release 3.1.1

started to migrate boxdata out of json into parse modules

updated readme

updated readme