GitLab

add model override argument from load_ensemble_for_inference at generation time, updating readme for stories

default samples_per_token in eval_lm

Also show a nicer error message.

When downloading files in examples directory (e.g. when running
`prepare-iwslt14.sh`), git sees them as untracked files but they should
not be committed.
Add a .gitignore script that ignore everything in the examples
subdirectories except for .sh and .md files.

Two tiny changes to train/eval_lm. For train fix an off by one, while for eval_lm make it work when the task is translation'