Add simplified model configuration for DeepSpeech2.

PaddlePaddle / Paddle

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Create a simplified model configuration for DeepSpeech2 on V2 APIs.
- With fixed-length (by padding) batches.
- With only bidirectional-GRU.
- With only greedy decoder (max + post-processing).
Here "simplified" refers to the above limitations, so that we can move on without being blocked by other un-resolved tasks (e.g. 2228, 2230 etc.).
About network architecture please refer to DS2 paper and the design doc.
Please test it on GPUs, and make sure to achieve at least a normal convergence.
Please pull your codes and docs into PaddlePaddle/models.

PaddlePaddle / Paddle