rm .DS_Store, #1
rm different versions of generated files in /build, #1
update js references affected by the previous commit, #1
rm empty markdown files, #1
rm non-sense files in /src, #1
update building json, #1
update tests, #1
fix the previous commit with delete operations,  #1
add build script for canvaschart.js, but not update result files, just set fileformat=unix, #1