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.cc b/motors/motor.cc
index af7a3c7..93f2a4d 100644
--- a/motors/motor.cc
+++ b/motors/motor.cc
@@ -13,7 +13,7 @@
 extern "C" float absolute_wheel(uint16_t reading);
 
 namespace frc971 {
-namespace salsa {
+namespace motors {
 
 Motor::Motor(BigFTM *pwm_ftm, LittleFTM *encoder_ftm, MotorControls *controls,
              const ::std::array<volatile uint32_t *, 3> &output_registers)
@@ -451,5 +451,5 @@
   return (counts_per_cycle() + width) / 2;
 }
 
-}  // namespace salsa
+}  // namespace motors
 }  // namespace frc971