Frame-semantic-transformer-downstream

Fix
* Align trigger-marked sentence to original sentence ([19](https://github.com/chanind/frame-semantic-transformer/issues/19)) ([`6683a22`](https://github.com/chanind/frame-semantic-transformer/commit/6683a224740ddd8a19a707247f732bfc9e694ba2))

Fix
* Auto-download omw-1.4 for inference ([`343906c`](https://github.com/chanind/frame-semantic-transformer/commit/343906c3a0df59cd111355d8aa84d33b39003459))

Feature
* New models trained on Framenet exemplars ([18](https://github.com/chanind/frame-semantic-transformer/issues/18)) ([`3f937fb`](https://github.com/chanind/frame-semantic-transformer/commit/3f937fbc475bd8600cb62ca885fcf0e4a80effba))

Feature
* Propbank ([16](https://github.com/chanind/frame-semantic-transformer/issues/16)) ([`4c53887`](https://github.com/chanind/frame-semantic-transformer/commit/4c538875be45c5b851286b1a17156b951c786a07))

Performance
* Minor performance improvements for arg extraction and frame detection ([15](https://github.com/chanind/frame-semantic-transformer/issues/15)) ([`7e03969`](https://github.com/chanind/frame-semantic-transformer/commit/7e039695b8cfa1ae5b8de1b9b4d4145e5bec3884))

Fix
* Fixing errors when no frames are found ([14](https://github.com/chanind/frame-semantic-transformer/issues/14)) ([`ef2424c`](https://github.com/chanind/frame-semantic-transformer/commit/ef2424cba57515b9aa8205fe29f015b57f26504e))