add broadcast test cases for add, or, xor, greater, less, add, sub, mul, div,
add broadcast test cases for add, or, xor, greater, less, add, sub, mul, div,

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