Add Object#to_s.
Add Object#to_s.

goby-lang/goby,goby-lang/goby,hachi8833/goby,st0012/Rooby,hachi8833/goby,Maxwell-Alexius/goby,Maxwell-Alexius/goby,st0012/Rooby,goby-lang/goby,hachi8833/goby,Maxwell-Alexius/goby