reduce warning
Implement Process.{,e}{u,g}id
Implement File::Stat#owned_real?
move code to ruby {executable,_real?}
To simple because ensured const define
Move code to ruby {read,write}able{,_real}?
Move to ruby owned?,owned_real?
Split header code
To simple define method
Split constants to File::Stat::Constants
Merge pull request #1 from ksss/move-to-ruby

Move to ruby