Imagesc

* output for all figures is changed to: fig, ax

Exciting update because d3js is implemented in imagesc now!
Check examples in readme file how to use it or alternatively, go to https://github.com/erdogant/d3heatmap for direct usage.
Have fun!

* checks for inputdata when using d3

* fix for missing files for d3 heatmap

* Implementation of d3 heatmap plot!

* library packaging included in the setup file