Improve the feedback when provided commands fail (#117)

Author: JonZeolla

functions.j2

@@ -338,6 +338,7 @@ function {{ function }}() {
     command "${FUNCNAME[0]}" "${arguments[@]}"
     return=${?}
     if [[ ${return:-1} != 0 ]]; then
+      _feedback ERROR "${FUNCNAME[0]} ${arguments[@]} exited ${return} in ${dir}"
       return ${return}
     fi