Multi-GPU training and inference (single node)

Updated readme for imagenet

Upsampling layer fixed for 0 dimension

Changed default value for cuda_fixed_working_buffers_ratio to 0.4

Allocating chunk of mem for fixed working buffers

Merge bugs fixed

Added ability to request strides for output of the model

Using CUDA 7.0 in VC projects now

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Fixed bug with dropout when error function is fuzed woth last activat…

…ion function