Development dependency specification

[Descent098]

With python you can specify "extra" requirements that can be conditionally installed. In our case we can add "dev" dependencies that are installed using pip install schulich-ignite[dev].

This would make the onboarding process easier for people. To do this we need to add the following lines to the bottom of setup.py:

setuptools.setup(
    ... # Other metadata
    install_requires=[
        'ipywidgets',
        'ipycanvas',
        'ipyevents'
    ],
    extras_require = {
        "dev" : [
                "mkdocs", 
                "mkdocs-material"]
)

While we're at it I think we should also add jupyter lab as a dependency. So it would be:

setuptools.setup(
    ... # Other metadata
    install_requires=[
        'jupyterlab'
        'ipywidgets',
        'ipycanvas',
        'ipyevents'
    ],
    extras_require = {
        "dev" : [
                "mkdocs", 
                "mkdocs-material"]
)