add: aux.lua has been added.
add: errno.lua has been added.
fix: second argument must be environment table.
fix: should return the return value of generated function.
add: error number EDFAULT has been added.
change: return values of verify function has been changed.
change: type of Check.enum method argument has been changed to instance of Enum class.
change: base class has been changed to AUX.
change: fix some bug and 'of' method has been added.
change: error number EDFAULT has been removed.
change: create verifier function at the init function.
change: rockspec has been updated.