Add dendrogram visualization & Jensen Shannon metric (piskvorky#1484)

* add notebook with js heatmap

* separate out vector conversion function

* modify notebook

* add cluster heatmap notebook

* print y-axis values

* correct y labels

* add nb details

* few more nb details

* add text labels

* print linkage/dendo data

* add annotations for all hierarchy levels

* make diff annotations symmetric

* add Plotly's dendrogram code

* train for more passes

* remove outputs

* remove plotly code and imports

* err.. re-run cells

* fix jensen spelling

* made requested changes