Run cpython tests as part of quick_check

Makefile

@@ -530,6 +530,7 @@ quick_check:
 	$(MAKE) check_format
 	$(MAKE) unittests
 	$(PYTHON) $(TOOLS_DIR)/tester.py -R pyston_dbg -j$(TEST_THREADS) -a=-S -k --order-by-mtime $(TESTS_DIR) $(ARGS)
+	$(PYTHON) $(TOOLS_DIR)/tester.py -R pyston_dbg -j$(TEST_THREADS) -a=-S -k --exit-code-only --skip-failing $(TEST_DIR)/cpython $(ARGS)
 
 Makefile.local:
 	echo "Creating default Makefile.local"