Add dev dependencies and cleanup ESLint file (#588)

.eslintrc.js

@@ -1,20 +0,0 @@
-module.exports = {
-    "extends": "airbnb",
-    "plugins": [
-        "react",
-        "jsx-a11y",
-        "import"
-    ],
-    "rules" : {
-      "max-len": [2, 120, 2],
-      "no-underscore-dangle": 0,
-      "global-require": 0,
-      "guard-for-in": 0,
-      "no-restricted-syntax": 0,
-      "no-param-reassign": 0,
-      "consistent-return": 0,
-      "import/no-extraneous-dependencies": 0,
-      "no-continue": 0,
-      "no-confusing-arrow" : 0
-    }
-};

.eslintrc.json

@@ -0,0 +1,20 @@
+{
+  "extends": "airbnb",
+  "plugins": [
+    "import",
+    "react",
+    "jsx-a11y"
+  ],
+  "rules": {
+    "max-len": [2, 120, 2],
+    "no-underscore-dangle": 0,
+    "global-require": 0,
+    "guard-for-in": 0,
+    "no-restricted-syntax": 0,
+    "no-param-reassign": 0,
+    "consistent-return": 0,
+    "import/no-extraneous-dependencies": 0,
+    "no-continue": 0,
+    "no-confusing-arrow" : 0
+  }
+}

package.json

@@ -33,7 +33,12 @@
   },
   "devDependencies": {
     "fs-extra": "^0.30.0",
-    "jsdoc-parse": "^1.2.7"
+    "jsdoc-parse": "^1.2.0",
+    "eslint": "^3.4.0",
+    "eslint-config-airbnb": "^10.0.0",
+    "eslint-plugin-import": "^1.14.0",
+    "eslint-plugin-react": "^6.2.0",
+    "eslint-plugin-jsx-a11y": "^2.2.0"
   },
   "optionalDependencies": {
     "node-opus": "^0.1.13"