Huggingface model example

notebook on HF models almost finished. It wont run in bloody jupyter notebooks but runs perfectly as script

Fix additive attention (#110)

removed all partial imports and all import * with the aim of avoiding potential circular imports issues and increase readability. Fixed a couple bugs along the way

3rd party integration example

* removed all notebooks so I could add them in next commit with correct names

* initial commit
* cleaned up names and missing headers in example notebooks
* issues with traitlets, trying to run on jupyterhub