Merge pull request #61 from wangguibao/develop

Add needed header in cube-server/src/main.cpp

cube/cube-server/src/main.cpp

@@ -12,6 +12,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
+#include <signal.h>
 #include <sys/stat.h>
 
 #include <brpc/server.h>