Make gnirehtet script fail on error
Make gnirehtet script fail on error

Like ./release, make ./gnirehtet bash script fail on error without using
"&&".

WPO-Foundation/gnirehtet,JonnyShuali/gnirehtet,Genymobile/gnirehtet,WPO-Foundation/gnirehtet,Genymobile/gnirehtet,WPO-Foundation/gnirehtet,Genymobile/gnirehtet,JonnyShuali/gnirehtet,WPO-Foundation/gnirehtet