Robert Macrae

This addresses issue https://github.com/ibab/tensorflow-wavenet/issues/364 train.py was attempting to write to the 'train' directory and throwing a `NotFoundError` here: https://github.com/ibab/tensorflow-wavenet/blob/master/train.py#L274 which could happen before the `makedirs()` line in the save function...

Add Generate Script

2

This wraps the audio generation into a script and generates an audio file reminiscent of (and to make comparisons with) the tensorflow-wavenet repo: https://github.com/ibab/tensorflow-wavenet/blob/master/generate.py