made clang format use google style, not explicitly listing all google style options
made clang format use google style, not explicitly listing all google style options

nudles/incubator-singa,apache/incubator-singa,apache/incubator-singa,nudles/incubator-singa,nudles/incubator-singa,nudles/incubator-singa,apache/incubator-singa,apache/incubator-singa,nudles/incubator-singa,apache/incubator-singa