Add a 'raw' layout for d3js visualizations

Add a 'raw' layout for d3js visualizations. The 'raw' layout has no
bootstrap css or js. It has very minimal styling.
Update d3js - simple bar chart v2
Add d3js - simple bar chart v3
Refactor d3js - simple bar chart v3
Update d3js - simple bar chart v3
Merge branch 'develop'