Custom line colors enabled in graphs
[#74535922]
Labels for the legend now are recognized in interactive JSON
[#74536668]
Bugfixes all around.
[#74536668]
Grapher now accepts CSS colors instead of arrays
Works in the graph itself as well as in the legend.
[#74535922]
[#74536668]
Updated lab-grapher to most recent master
Merge pull request #69 from concord-consortium/graph-line-colors-legend

Graphs have customizable line colors and integrated legend