Change pre-commit hook to call commands in new shell

githooks/pre-commit

@@ -27,7 +27,7 @@ cd $temp/index/
 
 if [ -n "$filter" ]; then
 	ln -s $GIT_DIR/ .git
-	$filter
+	sh -c "$filter"
 	git add --all
 	rm .git
 fi
@@ -35,7 +35,7 @@ fi
 if [ -n "$validate" ]; then
 	/bin/echo -e "\x1b[33mValidating commit\x1b[0m"
 	/bin/echo -e "\x1b[2mλ $validate\x1b[0m"
-	if $validate
+	if sh -c "$validate"
 	then
 		/bin/echo -e "\x1b[32mValidation Passed!\x1b[0m"
 	else