fix: workdir with iPhone Simulator
Merge pull request #23 from yinjimmy/dev

fix: workdir with iPhone Simulator
support set touchable tag in resource
fix miss set node touchable error
touch utility
touch sample
add parent pointer to sprite
reverse lookup
throw an error when mount sprite twice
Merge branch 'master' of github.com:cloudwu/ejoy2d into public
export lua symbol
remove api sprite.retrieve
remove the lua folder.
fixed iOS project.
and an android native activity.