Graph values

if a 2D tensor is returned with height === width, plot the X/Y graph.

Also, if an object is returned with {xs && ys} plot the graph. This second request is for a future of X/Y/Z possible graphs.

Here's a start: http://bit.ly/2OQmWVg

Start by reviewing the linked example and the repository's current tensor-rendering entry point to see how returned values are displayed. Implement the square 2D tensor graph and the {xs, ys} graph only after confirming the intended plotting behavior; done means both return shapes render correctly without disrupting existing visualizations.

Written by the indexing model from the issue text.