Support OBL - Logging format

[willwade]

Agreed that we should - somehow - support the OBL format for measuring success.

If In someway we can measure mistakes and error correction - that would be far more useful than just the training text file that is currently created in v5.

More info on format here: https://docs.google.com/document/d/1KpC82nQc8RscgYZWKQo-y_LlKSwd8VsuvhnjrIve2f4/edit

Its understood that we would need to extend and further work on this format