Add eslint with basic rules.

Run with:
npm run lint

Add lint fix command too:
npm run lint-fix

Closes #34

.eslintrc.js

@@ -0,0 +1,26 @@
+module.exports = {
+    "env": {
+        "browser": true,
+        "node": true
+    },
+    "parser": "babel-eslint",
+    "extends": "eslint:recommended",
+    "rules": {
+        "indent": [
+            "error",
+            2
+        ],
+        "linebreak-style": [
+            "error",
+            "unix"
+        ],
+        "quotes": [
+            "error",
+            "single"
+        ],
+        "semi": [
+            "error",
+            "always"
+        ]
+    }
+};

package.json

@@ -8,7 +8,8 @@
     "test": "cross-env NODE_ENV=test BABEL_DISABLE_CACHE=1 mocha --retries 2 --compilers js:babel-register --recursive --require ./test/setup.js test/**/*.spec.js",
     "test-watch": "npm test -- --watch",
     "test-e2e": "cross-env NODE_ENV=test BABEL_DISABLE_CACHE=1 mocha --retries 2 --compilers js:babel-register --require ./test/setup.js ./test/e2e.js",
-    "lint": "eslint --ignore-path .gitignore --format=node_modules/eslint-formatter-pretty app test *.js",
+    "lint": "./node_modules/.bin/eslint --ignore-path .gitignore *.js app",
+    "lint-fix": "npm run lint -- --fix",
     "hot-server": "cross-env NODE_ENV=development node --max_old_space_size=2096 -r babel-register server.js",
     "build-main": "cross-env NODE_ENV=production node -r babel-register ./node_modules/webpack/bin/webpack --config webpack.config.electron.js --progress --profile --colors",
     "build-renderer": "cross-env NODE_ENV=production node -r babel-register ./node_modules/webpack/bin/webpack --config webpack.config.production.js --progress --profile --colors",
@@ -117,9 +118,9 @@
     "electron-builder": "^8.3.0",
     "electron-devtools-installer": "^2.0.1",
     "enzyme": "^2.5.1",
-    "eslint": "^3.9.1",
+    "eslint": "^3.12.1",
     "eslint-config-airbnb": "^13.0.0",
-    "eslint-formatter-pretty": "^1.1.0",
+    "eslint-config-standard": "^6.2.1",
     "eslint-import-resolver-webpack": "^0.7.0",
     "eslint-loader": "^1.6.0",
     "eslint-plugin-flowtype-errors": "^1.5.0",
@@ -128,6 +129,7 @@
     "eslint-plugin-mocha": "^4.7.0",
     "eslint-plugin-promise": "^3.3.0",
     "eslint-plugin-react": "^6.7.1",
+    "eslint-plugin-standard": "^2.0.1",
     "express": "^4.14.0",
     "extract-text-webpack-plugin": "^1.0.1",
     "fbjs-scripts": "^0.7.1",