Add sabertooth lib, start enabling all motor drive

lib/Sabertooth/examples/2.Settings/Persistent/BaudRate/BaudRate.ino

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+// Set Baud Rate Sample for Packet Serial
+// Copyright (c) 2012 Dimension Engineering LLC
+// See license.txt for license details.
+
+// WARNING: This sample makes changes that will persist between restarts.
+// NOTE: The setBaudRate function will only have an effect on V2 controllers (2x12, 2x25 V2, 2x60, SyRen 50).
+//       Earlier controllers automatically detect the baud rate you choose in Serial.begin
+//       when you call the autobaud function. Autobaud was replaced in V2 controllers for reliability
+//       in the event that the Sabertooth lost power.
+#include <Sabertooth.h>
+
+Sabertooth ST(128);
+
+void setup()
+{
+  // This sample will tell the Sabertooth *at 9600 baud* to *switch to 2400 baud*.
+  // Keep in mind you must send the command to change the baud rate *at the baud rate
+  // the Sabertooth is listening at* (factory default is 9600). After that, if it works,
+  // you will be able to communicate using the new baud rate.
+  //
+  // Options are:
+  //   2400
+  //   9600
+  //   19200
+  //   38400
+  //   115200 (only supported by some devices such as 2X60 -- check the device's datasheet)
+  //
+  // WARNING: The Sabertooth remembers this command between restarts.
+  // To change your Sabertooth back to its default, you must *be at the baud rate you've
+  // set the Sabertooth to*, and then call ST.setBaudRate(9600)
+  SabertoothTXPinSerial.begin(9600);
+  ST.setBaudRate(2400);
+  SabertoothTXPinSerial.end();
+
+  // OK, we're at 2400. Let's talk to the Sabertooth at that speed.
+  SabertoothTXPinSerial.begin(2400);  
+}
+
+void loop()
+{
+  ST.drive(0);
+  ST.turn(20);
+  delay(2000);
+  
+  ST.turn(-20);
+  delay(2000);
+}
+