EAVL-25 Added percentage to PDF threshold brush
Added a more efficient columnNameToIndex for multiple column names
Skeleton JS code
Group by controller
Fixed holeid getting double referenced in some calculations
Support for SVG class in BaseD3Chart
Skeleton code for BH preview GUI
BH preview mostly working (really slow). Needs optimisation
Fixed unit tests
Merge pull request #4 from joshvote/bh-preview

Prototype Borehole Estimate Preview