Add tutorial, cleanup documentation

See #62

Fix important bug in opcode counts calculation

Merge pull request #107 from MikeSmithEU/master

fix opcode counts bug

Which probably will become the 1.0.0

Close to first release!

1.0rc2

Merge pull request #98 from ebu/issue/83/readthedocs

oops, fix typo

Pre-release: CLI, normalization API and metrics

This non-production pre-release includes a CLI for the basic building blocks:

• Apply user-defined text normalization rules to the reference and hypothesis files
• Convert text to a standard transcript format (words only)
• Return diff results and WER

This release also includes a user interface that allows the user to experiment with the normalization rules. It is included for convenience and is not part of the core functionality.