Add ESLint

Author: citizen428

.eslintrc.json

@@ -0,0 +1,8 @@
+{
+    "extends": "airbnb",
+    "plugins": [
+        "react",
+        "jsx-a11y",
+        "import"
+    ]
+}

README.md

@@ -12,6 +12,8 @@ To get going clone this repository and perform the following steps:
 1. Change application name in `config/application.rb`.
 1. Update `database.yml` to reflect the new application name.
 1. If you plan on using Figaro, copy `config/application.yml.example` to `config/application.yml`.
+1. ESLint is preconfigured for modern JS with React support (AirBnB styleguide). If you want to use
+   it install packages with `npm install`, otherwise remove `.eslintrc` and `package.json`. 
 1. If you don't plan on tracking the template, you can remove the `.git` directory. 
    Otherwise you can rename the remote:   
    ```shell

package.json

@@ -1,5 +1,12 @@
 {
   "name": "rails_new",
   "private": true,
-  "dependencies": {}
+  "dependencies": {},
+  "devDependencies": {
+    "eslint": "^3.19.0",
+    "eslint-config-airbnb": "^15.0.1",
+    "eslint-plugin-import": "^2.2.0",
+    "eslint-plugin-jsx-a11y": "^5.0.3",
+    "eslint-plugin-react": "^7.0.1"
+  }
 }

scripts/setup

@@ -30,6 +30,7 @@ printf "Please update the following locations:\n\n"
 fgrep -rn "TODO:" app config spec | while read -r line ; do 
     echo "  * $line"
 done 
+echo "  * Update project name in package.json"