Changed the output image format because it was no longer valid in hydro.

src/firewire_camera_driver_node.cpp

@@ -73,7 +73,7 @@ void FirewireCameraDriverNode::mainNodeThread(void)
           if(config.coding==MONO || config.coding==RAW)
           {
             if(config.depth==DEPTH8)
-              this->Image_msg_.encoding="8UC1";
+              this->Image_msg_.encoding="mono8";
             else if(config.depth==DEPTH16)
               this->Image_msg_.encoding="16UC1";
             else