fix tests for "unclassify"

Because _Main is __export__ by default, _Main won't be unclassified.
ammend fd21bc3a6db152c2db8781565ff5a1dd6a4da31b to fix test launcher

Call only "__export__" test methods
Allow `--test --output FILE` to save testing executable
skip source-map tests if --minify specified
close #144; the author must do `make publish` instead of `npm publish`