Feature/arackis/make work with d3 v7 (#307)

* Install d3, update Jest to transpile d3

* Fix unit tests - negative numbers were using the wrong negative unicode character

* Include d3@6 as acceptable

* Undo whitespace changes in jest config

babel.config.js

@@ -0,0 +1,26 @@
+module.exports = {
+  presets: [
+    [
+      '@babel/preset-env',
+      {
+        targets: {
+          browsers: '> 3%',
+        },
+      },
+    ],
+    '@babel/preset-react',
+    '@babel/preset-flow',
+  ],
+  plugins: [
+    '@babel/plugin-proposal-class-properties',
+    '@babel/plugin-proposal-object-rest-spread',
+  ],
+  env: {
+    production: {
+      plugins: ['lodash'],
+    },
+    test: {
+      plugins: ['babel-plugin-rewire'],
+    },
+  },
+};

jest.config.js

@@ -1,14 +1,14 @@
+const dontTranspiledThese = ['internmap', 'delaunator', 'robust-predicates'];
+const dontTranspile = dontTranspiledThese.join('|');
+
 const config = {
-    collectCoverage: true,
-    collectCoverageFrom: [
-        'src/**/*.js'
-    ],
-    setupFiles: [
-        '<rootDir>/tests/jsdom/setup.js'
-    ],
-    setupFilesAfterEnv: [
-        './node_modules/jest-enzyme/lib/index.js'
-    ],
+  collectCoverage: true,
+  collectCoverageFrom: ['src/**/*.js'],
+  setupFiles: ['<rootDir>/tests/jsdom/setup.js'],
+  setupFilesAfterEnv: ['./node_modules/jest-enzyme/lib/index.js'],
+  transformIgnorePatterns: [
+    `[/\\\\]node_modules[/\\\\]((?!(?<=[/\\\\])(d3-?|${dontTranspile})).)+\\.(js|jsx|ts|tsx)$`,
+  ],
 };
 
-module.exports = config;
+module.exports = config;