housekeeping: removed commented code

src/utils.jl

@@ -152,12 +152,4 @@ function jacobian(m,x)
         xp.grad .*= 0 # Reset gradient accumulator
     end
     J'
-end
+end
-
-# struct StopException <: Exception 
-#   x::Symbol
-# end
-
-# function stop(x)
-#   throw(StopException(x))
-# end