Use carthage.sh instead of the stock carthage

Author: loremattei

Scripts/carthage_script.sh

@@ -3,5 +3,5 @@ cd "${PROJECT_DIR}/Example"
 if [ -d "Carthage/Build/iOS" ]; then
 	echo "Carthage: found dependencies!"
 else
-	carthage update
+	./carthage.sh update
 fi