singleton
ok for mac
podspec
change include header path for pods
remove brew update from xctool
recover xctool config
podspec update [ci skip]
Merge pull request #1 from longbai/master

change include header path for pods
objective-c-sdk convert to objc-sdk
add default init to header
Merge pull request #2 from longbai/update_readme

Readme update for repo name
remove useless code
add crc
update version
add 406 retry
podspec optimize
add crc32 for formupload
format
add crc for resume
Merge pull request #4 from longbai/add_crc

crc32  check