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>

src/serial_query.cpp

@@ -8,7 +8,8 @@
 
 namespace create {
 
-  SerialQuery::SerialQuery(std::shared_ptr<Data> d) : Serial(d),
+  SerialQuery::SerialQuery(std::shared_ptr<Data> d, bool install_signal_handler)
+  : Serial(d, install_signal_handler),
     streamRecoveryTimer(io),
     packetID(ID_BUMP_WHEELDROP),
     packetByte(0),