chore: Upgrade Babel, Jest, Eslint (#1437)

* chore: Upgrade Prettier 1.8 -> 2.0

* chore: Upgrade Babel 6 -> 7

* chore: Upgrade eslint plugins

* chore: Add eslint import/order rules

* chore: Update flow-typed deps

.eslintrc

@@ -14,6 +14,46 @@
     "eqeqeq": 2,
     "no-unused-vars": 2,
     "no-mixed-operators": "off",
+    "import/order": [
+      "error",
+      {
+        "alphabetize": {
+          "order": "asc"
+        },
+        "pathGroups": [
+          {
+            "pattern": "shared/**",
+            "group": "external",
+            "position": "after"
+          },
+          {
+            "pattern": "stores",
+            "group": "external",
+            "position": "after"
+          },
+          {
+            "pattern": "stores/**",
+            "group": "external",
+            "position": "after"
+          },
+          {
+            "pattern": "models/**",
+            "group": "external",
+            "position": "after"
+          },
+          {
+            "pattern": "scenes/**",
+            "group": "external",
+            "position": "after"
+          },
+          {
+            "pattern": "components/**",
+            "group": "external",
+            "position": "after"
+          }
+        ]
+      }
+    ],
     "flowtype/require-valid-file-annotation": [
       2,
       "always",
@@ -41,8 +81,7 @@
     "react": {
       "createClass": "createReactClass",
       "pragma": "React",
-      "version": "detect",
-      "flowVersion": "0.86"
+      "version": "detect"
     },
     "import/resolver": {
       "node": {