Move all the motors stuff into a saner namespace

Letting the mechanical engineers name software is never a good idea...

Change-Id: I5d0e43d84a8f45693435472cc0e5e288f6190b14
diff --git a/motors/motor.h b/motors/motor.h
index c59458c..f657d13 100644
--- a/motors/motor.h
+++ b/motors/motor.h
@@ -14,7 +14,7 @@
 #include "motors/core/time.h"
 
 namespace frc971 {
-namespace salsa {
+namespace motors {
 
 class MotorControls {
  public:
@@ -182,7 +182,7 @@
   teensy::AcmTty *debug_tty_ = nullptr;
 };
 
-}  // namespace salsa
+}  // namespace motors
 }  // namespace frc971
 
 #endif  // MOTORS_MOTOR_H_