Remove second Leaky Relu after BN in residual blocks from generator

Fix bug in keras 1.2.1 (TypeError standardize_input_data got an unexpected keyword)

Correct implementation of gan image smoothing

Updated README to reflect changes

Fixed SRGAN full model training

Fixed Discriminator training

Normalization now applies tanh scaling when mode='gan' [0, 255] -> [-1, 1]

Upscaling now uses Nearest Neighbour upscaling.

Update Normalize layer

Update regularizers losses to new method for keras 1.2.0

Updated regularizers to support Keras master changes to regularizers

Fixed SRGAN training. Thanks to @tingweiwang1993

Fixed SRGAN training. Thanks to @tingweiwang1993

Merge branch 'dev' of https://github.com/titu1994/Super-Resolution-using-Generative-Adversarial-Networks

Begin correct implementation of SRGAN full model