Add free method to Aurora.

src/Function.cpp

@@ -149,6 +149,10 @@ namespace Aurora {
         return (double *) mkl_malloc(size * sizeof(std::complex<double>), 64);
     }
 
+    void free(void* ptr){
+        mkl_free(ptr);
+    }
+
     double * mul(double scalar, double *input, int size) {
         double* output = malloc(size);
         vdMulI(size,input,1,&scalar,0,output,1);