Custom line colors enabled in graphs
[#74535922]
Graphs now generate legends
Also did some minor formatting and code cleanup.
[#74536668]
Bugfixes all around.
[#74536668]
Whitespace and README fixes
[#74536668]
Merge pull request #9 from concord-consortium/graph-line-colors-legend

Graphs have customizable line colors and integrated legend
Quick formatting fixes

I missed a newline so the markdown wasn't rendering properly.
Grapher now accepts CSS colors instead of arrays
Works in the graph itself as well as in the legend.
[#74535922]
[#74536668]
Merge pull request #10 from concord-consortium/graph-css-colors

Grapher now accepts CSS colors instead of arrays
Use protocol relative links for scripts

and use CDN for d3 since the main d3 site doesn't support https.