add comments
zpipe -> zlib-asm
move dist -> root
zpipe -> zlib-asm
add Promises Polyfill
delete Promises
add ES6 Promises
use ES6 Promises
add file utils
refact mimefile
refact codes
update comments
port zlib.stream apis
add stream APIs
add stream API
update README
use then
add `crc` argument
return Uint8Array
small fix