[#5] idioms:d-1-3 is done. Added multiple senses of the same idiom as a list

[#2] evaluating m-1-2 works. config.yaml simplified.

[#2] Support for d-1-2 done. Support for m-1-2 partially done (need to implement the testing logic with some valid metrics)

[#1] refactoring: Alpha -> Seq2Seq. We rely on git tags for versioning models.

[#1] checkpoint before amending builders.py

saving this branch