Merge pull request #1606 from thinkyhead/cleanup_stepper

Cleanup of stepper.cpp

Marlin/Marlin.h

@@ -32,6 +32,9 @@
   #include "WProgram.h"
 #endif
 
+#define BIT(b) (1<<(b))
+#define TEST(n,b) ((n)&BIT(b)!=0)
+
 // Arduino < 1.0.0 does not define this, so we need to do it ourselves
 #ifndef analogInputToDigitalPin
   #define analogInputToDigitalPin(p) ((p) + 0xA0)