* Add a run_pipeline utility
* Add more tests for training
* Rewrite train.sh into train.py
* Add the pipeline to the PYTHONPATH
* Ensure that the W&B tracker throws errors in CI
* Add the Taskcluster environment variables so test-fast works on the train test
* Address review comments
* Adjust opus trainer settings
* Fix optimizer delay
* Use default learning rate
* Enable back translations
* Report learning rate for teacher
* Remove old link
* Match validation and save frequency
* Roll back learning rate
* Disable snakemake dry run
* Add a note about optimizer delay
* Add a link to opus trainer paper
integrated OpusTrainer in train.sh
added dataset importer that can augment datasets for evaluation
removed teacher fine-tuning step. The pre-training and fine-tuning are now done in one step
removed merge-augmented step
adjusted pipeline settings to work with a higher amount of data
modified the Snakemake pipeline accordingly but didn't test
updated browsermt marian
added docs
added unit tests
Greg Tatum
Evgeny Pavlov