Eslint config and pretty code (#161)

* Make getContent to be static

* Add eslint to editor

* clearn up

.eslintrc

@@ -0,0 +1,49 @@
+{
+  "parser": "babel-eslint",
+  "extends": ["airbnb", "prettier", "prettier/react"],
+  "globals": {
+    "_": false
+  },
+  "env": {
+    "browser": true,
+    "node": true
+  },
+  "rules": {
+    "indent": [
+      "error",
+      2,
+      {
+        "ArrayExpression": "first"
+      }
+    ],
+    "comma-dangle": 0,
+    "max-len": 0,
+    "jsx-quotes": [2, "prefer-double"],
+    "quotes": [
+      2,
+      "double",
+      {
+        "avoidEscape": true
+      }
+    ],
+    "arrow-parens": ["error", "always"],
+    "no-plusplus": [
+      "error",
+      {
+        "allowForLoopAfterthoughts": true
+      }
+    ],
+    "eol-last": ["error", "always"],
+    "class-methods-use-this": 0,
+    "function-paren-newline": 0,
+    "react/prefer-stateless-function": 0,
+    "react/forbid-prop-types": 0,
+    "jsx-a11y/anchor-is-valid": 0,
+    "react/sort-comp": 0,
+    "prefer-destructuring": 0,
+    "react/require-default-props": 0,
+    "import/no-extraneous-dependencies": 0,
+    "import/extensions": 0,
+    "import/no-unresolved": 0
+  }
+}

.prettierrc

@@ -0,0 +1,4 @@
+{
+  "trailingComma": "all",
+  "arrowParens": "always"
+}