Execnb

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)

New Features

- use fork mode on mac ([22](https://github.com/fastai/execnb/issues/22))

- Use nbdev2

Bugs Squashed

- do not fail if matplotlib is not installed when running `%matplotlib inline` ([6](https://github.com/fastai/execnb/pull/6)), thanks to [hamelsmu](https://github.com/hamelsmu)

- Add notebook dir to python path

- Compat with nbdev test runner