Update d3 and d3-tip; need to fix the color/padding of d3-tip
Include colorbrewer
Add ReadMe files for d3 and d3-tip
curvechart: revise default stroke colors
Get rid of the copies of d3 and d3-tip
Add colorbrewer links to curvechart (plus related utility)
Add ReadMe to inst/panels subdirectory
Remove d3 and d3-tip from inst/panels/.gitignore
pull out panel utility functions as a separate file, for less duplication
Consolidate the panel css files as one file