use c3 for stacked spline

package.json

@@ -34,6 +34,7 @@
     "jquery": "2.2.0",
     "bootstrap": "3.3.6",
     "d3": "3.5.12",
+    "c3": "0.4.11-rc4",
     "raw-loader": "0.5.1",
     "sass-loader": "3.1.2",
     "style-loader": "^0.12.3",
@@ -41,6 +42,7 @@
     "react-templates-loader": "0.4.0",
     "node-sass": "3.4.2",
     "moment-timezone": "0.5.0",
+    "cheerio": "0.20.0",
     "yargs": "3.32.0",
     "extend": "3.0.0",
     "through2": "2.0.1",