Add option to disable signal handlers (#65)

This gives the user the option to create their own signal handler without having create::Create interfere.
They can disable the sigint/sigterm handler and be responsible for disconnecting from the robot themselves.

Signed-off-by: Jacob Perron <jacobmperron@gmail.com>

include/create/serial_query.h

@@ -67,7 +67,7 @@ namespace create {
       void processByte(uint8_t byteRead);
 
     public:
-      SerialQuery(std::shared_ptr<Data> data);
+      SerialQuery(std::shared_ptr<Data> data, bool install_signal_handler = true);
   };
 }  // namespace create