fixed PID initialisation

libraries/PID/PID.h

@@ -17,7 +17,11 @@ public:
     PID(const float &initial_p = 0.0,
         const float &initial_i = 0.0,
         const float &initial_d = 0.0,
-        const int16_t &initial_imax = 0.0)
+        const int16_t &initial_imax = 0) :
+		_kp  (initial_p),
+		_ki  (initial_i),
+		_kd  (initial_d),
+		_imax(initial_imax)
     {
 	}