Test runtimes

Windows:
Running test Examples/Image/MNIST/01_OneHidden (debug cpu) - [OK] 808.62 sec
Running test Examples/Image/MNIST/01_OneHidden (debug gpu) - [OK] 86.82 sec
Running test Examples/Image/MNIST/01_OneHidden (release cpu) - [OK] 49.23 sec
Running test Examples/Image/MNIST/01_OneHidden (release gpu) - [OK] 19.37 sec

Linux:
Running test Examples/Image/MNIST/01_OneHidden (debug cpu) - [OK] 170.07 sec
Running test Examples/Image/MNIST/01_OneHidden (debug gpu) - [OK] 24.82 sec
Running test Examples/Image/MNIST/01_OneHidden (release cpu) - [OK] 20.71 sec
Running test Examples/Image/MNIST/01_OneHidden (release gpu) - [OK] 8.17 sec