fix header guard naming conv
fix header guard naming conv


Former-commit-id: 809d0980ac5a70edfc79d9c08339f530a2b5a42d
shuheik/dynet,xunzhang/dynet,xunzhang/dynet,clab/cnn,danielhers/dynet,danielhers/dynet,shuheik/dynet,chunyang-wen/dynet,danielhers/dynet,danielhers/dynet,danielhers/dynet,xunzhang/dynet,chunyang-wen/dynet,clab/dynet,danielhers/dynet,clab/cnn,chunyang-wen/dynet,clab/dynet,clab/dynet,chunyang-wen/dynet,shuheik/dynet,shuheik/dynet,danielhers/dynet,clab/cnn,clab/dynet,shuheik/dynet,xunzhang/dynet,shuheik/dynet,clab/dynet,clab/dynet,shuheik/dynet,clab/dynet