grader updates from CS431 (#11)

* If any of linters fail, don't run the tests.
* If build fails, echo the error message to stderr.
* Fix sanitizer options.
* Don't use colored output (it messes up gg log).
* $@ → "$@"
* $@ → $* in string

scripts/grade-01.sh

@@ -18,8 +18,7 @@ RUNNERS=(
 )
 
 # Lints.
-cargo fmt --check
-cargo clippy
+run_linters || exit 1
 
 # Executes test for each runner.
 for RUNNER in "${RUNNERS[@]}"; do