Update and improve color deconvolution example (#350)
Update and improve color deconvolution example (#350)

* Rerun and make minimal changes to color-deconvolution.ipynb

* Use the included stain_color_map

Also factor in creating W

* Use separate_stains_xu_snmf and separate_stains_macenko_pca

* Use larger headings

* Add a little more documentation to color_deconvolution example

* Renumber inputs in color-deconvolution.ipynb

* Make adaptive methods subheadings

DigitalSlideArchive/HistomicsTK,DigitalSlideArchive/HistomicsTK