Bokeh

- integrated bokeh on backend&frontend side (bbossy's changes)
- added example workbook
- started work on "simplification" layer for bokeh-scala (imho poorly documented, please give feedback here -> software design could probably be better... not 100% sure yet on which direction to take). Idea: simplify the 80% tasks/plots data analyst have to do in terms of plots/statistical analysis.
- added spark configurator workbook
Good idea. Also, I am not 100% sure at which direction to take in terms of the design. The target I had in mind is to make 80% of the visualization tasks data analysts/scientists usually have really easy with wrappers.