Remove colons from the datestring to have logdir (#28)
Remove colons from the datestring to have logdir (#28)

It is to avoid the path issue as follows on restoring checkpoint later.

```
tensorflow.python.framework.errors.UnimplementedError: File system scheme `{{ incomplete_path }}` not implemented
```

where `{{ incomplete_path }}` is like: `logdir/train/2016-09-18T01` (terminated before the colon).
kutakieu/tensorflow-wavenet,ibab/tensorflow-wavenet,genekogan/tensorflow-wavenet,thakkarV/tensorflow-wavenet,thakkarV/tensorflow-wavenet,ibab/tensorflow-wavenet,kutakieu/tensorflow-wavenet,jyegerlehner/tensorflow-wavenet,jyegerlehner/tensorflow-wavenet,genekogan/tensorflow-wavenet