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/peripheral/adc.h b/motors/peripheral/adc.h
index 04caff7..677fa18 100644
--- a/motors/peripheral/adc.h
+++ b/motors/peripheral/adc.h
@@ -9,7 +9,7 @@
 // single file like this.
 
 namespace frc971 {
-namespace salsa {
+namespace motors {
 
 struct MediumAdcReadings {
   uint16_t motor_currents[3][2];
@@ -47,7 +47,7 @@
 JoystickAdcReadings AdcReadJoystick(const DisableInterrupts &);
 SimpleAdcReadings AdcReadSimple(const DisableInterrupts &);
 
-}  // namespace salsa
+}  // namespace motors
 }  // namespace frc971
 
 #endif  // MOTORS_PERIPHERAL_ADC_H_