Add IPython Jupyter Notebook support

[shivam-tripathi]

It would be great to have sqlalchemy_schemadisplay render final image inside Jupyter Notebook.

[fschulze]

Since I don't use Jupyter myself (yet), someone needs to implement that. Happy to merge a PR and make a release.

[psychemedia]

An intermediate way of doing this is to save a dummy SVG and then view it in the notebook:

from IPython.display import SVG

graph.write_svg('test.svg')
SVG('test.svg')

[psychemedia]

I've made some sort of attempt at this here: https://github.com/innovationOUtside/ipython_magic_sqlalchemy_schemadisplay