New Features
- add `mk_cell` ([25](https://github.com/fastai/execnb/issues/25))
- Add new nb function ([23](https://github.com/fastai/execnb/pull/23)), thanks to [dleen](https://github.com/dleen)
- Parameterize Notebooks ([19](https://github.com/fastai/execnb/issues/19))
- (This was completed earlier but not marked done in gh issues)