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.cc b/motors/peripheral/adc.cc
index 90b1d0d..6249392 100644
--- a/motors/peripheral/adc.cc
+++ b/motors/peripheral/adc.cc
@@ -3,7 +3,7 @@
 #include "motors/core/kinetis.h"
 
 namespace frc971 {
-namespace salsa {
+namespace motors {
 namespace {
 
 #define ADC_SC2_BASE (ADC_SC2_REFSEL(0) /* Use the external reference pins. */)
@@ -270,5 +270,5 @@
   return r;
 }
 
-}  // namespace salsa
+}  // namespace motors
 }  // namespace frc971