Added code for GRU and Peephole-LSTM #2
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The GRU based approach performs really well and takes less time, making it an optimal choice in a time constrained environment. Whereas, the Peephole-LSTM approach gives competitive results when compared to GPPN (i.e. LSTM based approach), as it converges to the optimal result in much less number of epochs. Making it a desirable choice in an environment with limitation on availability of computational power.