Test the Trained Network: calculate and print avg test loss

[felipeLx]

Have a typo on the code. On the part of #calculate and print avg test loss

Don't exist the variable "classes", looks that should be "class_total" instead.

On for loop / else condition. Now it's:
print('Test Accuracy of %5s: N/A (no training examples)' % (classes[i]))\n"

But looks that should be:
print('Test Accuracy of %5s: N/A (no training examples)' % (class_total[i]))