Allow bail to use stdin for input

dot_local/share/buddy/lib/bail.sh

@@ -1,4 +1,8 @@
-bail() (
-	echo >&2 "$@"
+bail() {
+	if [ $# == 0 ]; then
+		cat >&2
+	else
+		echo >&2 "$@"
+	fi
 	exit 1
-)
+}