Kweon Woo Jung(Chris Jung)

Results 2 issues of Kweon Woo Jung(Chris Jung)

Fix is implemented in Pull Request #1

## Problem Current implementation fails to reproduce `semi-supervised` method you mention in `solution.pdf`. This is due to [`data.py` #L103~104](https://github.com/xiaozhouwang/tensorflow_speech_recognition_solution/blob/master/data.py#L103-L104) where all the test data is assigned a label of `len(self.label_words_dict)`,...