refactor and change option names of _simple and _yes
add input and message options
IO#syswrite should be faster than IO#write because it directly calls write(2)
Revert "IO#syswrite should be faster than IO#write because it directly calls write(2)"

IO#syswrite has made it slower... It seems IO#syswrite can not write to buffered
IO, that is always same with IO#sync = true
0.2.0