dcgan.caffe: A pure caffe-python implementation of DC-GAN

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As far as I know, there is no light-weight implementation of DCGAN based on caffe.

Inspired by DeePSiM implementation, a few lines of python code can train the dcgan model quickly without any hack in caffe core lib (Dosovitskiy has already done this. However, I think the code could be merged back to master branch).

The training and generating code will be released in days.