Allowed custom input and working directory paths
Fixed CE updater in CUDA backend
Added rgb_to_yuv_convert_layer_tester in CPU backend
Allowed rgb_to_yuv_convert tester in CPU backend
Fixed corner case with large texture size
1) Readers are redesign to allow variable data readers, 2) SGD is added, 3) classifier_result is extended to top-N, 4) Multiple epoch in a single data reader functionality added