nnForge v1.1.8

Hi, nnForge v1.1.8 is released:

• Sparse (in feature map dimension) convolutional layer added, with full support in CPU backend and fully connected (spatial) 1x1 support in GPU backend
• You can use -std=c++11 now with CUDA 6.5 toolkit
• Gradient check added
• GTSRB switched to batch training
• Boost and OpenCV libs default paths are /usr now
• Improved performance for 1x1 convolutions in GPU backend
• Minor fixes