color hexes for data vizualizations

colors.rb

  #http://colorbrewer2.org/
  COLOR_BREWER_SEQUENTIAL_BLUES = ["#f7fbff","#deebf7","#c6dbef","#9ecae1","#6baed6","#4292c6","#2171b5","#08519c","#08306b"]
  COLOR_BREWER_SEQUENTIAL_GREENS = ["#f7fcf5","#e5f5e0","#c7e9c0","#a1d99b","#74c476","#41ab5d","#238b45","#006d2c","#00441b"]
  COLOR_BREWER_SEQUENTIAL_GREYS = ["#ffffff","#f0f0f0","#d9d9d9","#bdbdbd","#969696","#737373","#525252","#252525","#000000"]
  COLOR_BREWER_SEQUENTIAL_ORANGES = ["#fff5eb","#fee6ce","#fdd0a2","#fdae6b","#fd8d3c","#f16913","#d94801","#a63603","#7f2704"]
  COLOR_BREWER_SEQUENTIAL_PURPLES = ["#fcfbfd","#efedf5","#dadaeb","#bcbddc","#9e9ac8","#807dba","#6a51a3","#54278f","#3f007d"]
  COLOR_BREWER_SEQUENTIAL_REDS = ["#fff5f0","#fee0d2","#fcbba1","#fc9272","#fb6a4a","#ef3b2c","#cb181d","#a50f15","#67000d"]
  COLOR_BREWER_QUALITATIVE_VIBRANTS = ["#a6cee3","#1f78b4","#b2df8a","#33a02c","#fb9a99","#e31a1c","#fdbf6f","#ff7f00","#cab2d6","#6a3d9a","#ffff99"]
  COLOR_BREWER_QUALITATIVE_PASTELS = ["#8dd3c7","#ffffb3","#bebada","#fb8072","#80b1d3","#fdb462","#b3de69","#fccde5","#d9d9d9","#bc80bd","#ccebc5"]
  COLOR_BREWER_DIVERGING_REDGREEN = ["#a50026","#d73027","#f46d43","#fdae61","#fee08b","#ffffbf","#d9ef8b","#a6d96a","#66bd63","#1a9850","#006837"]

  #http://public.tableausoftware.com/profile/#!/vizhome/TableauColors/ColorPaletteswithRGBValues
  TABLEAU_20 = ["#98DF8A","#FFBB78","#FF7F0E","#AEC7E8","#2CA02C","#1F77B4","#FF9896","#D62728","#C5B0D5","#9467BD","#F7B6D2","#E377C2","#C49C94","#8C564B","#7F7F7F","#DBDB8D","#C7C7C7","#BCBD22","#9EDAE5","#17BECF"]