Adds linting, prettier

Includes package-lock.json from npm 5.

.eslintignore

@@ -0,0 +1,6 @@
+/node_modules
+/index.js
+/velocity-component.js
+/velocity-helpers.js
+/velocity-transition-group.js
+/lib

.eslintrc

@@ -0,0 +1,25 @@
+{
+  "parser": "babel-eslint",
+  "env": {
+    "browser": true,
+    "node": true,
+    "es6": true
+  },
+  "plugins": [
+    "import",
+    "react",
+    "prettier"
+  ],
+  "extends": [
+    "eslint:recommended",
+    "plugin:react/recommended",
+    "prettier",
+    "prettier/react"
+  ],
+  "rules": {
+    "prettier/prettier": ["error", {
+      "singleQuote": true,
+      "trailingComma": "es5"
+    }]
+  }
+}

demo/app.js

@@ -2,4 +2,7 @@ var React = require('react');
 var ReactDOM = require('react-dom');
 var MainComponent = require('./main');
 
-ReactDOM.render(React.createElement(MainComponent), document.getElementById('app'));
+ReactDOM.render(
+  React.createElement(MainComponent),
+  document.getElementById('app')
+);

demo/webpack.config.js

@@ -1,31 +1,28 @@
-var webpack = require('webpack');
-
 module.exports = {
   context: __dirname,
   entry: './app.js',
   devtool: 'eval',
   resolve: {
-    extensions: ['', '.js', '.jsx']
+    extensions: ['', '.js', '.jsx'],
   },
   output: {
     path: __dirname + '/build',
-    filename: 'bundle.js'
+    filename: 'bundle.js',
   },
   module: {
     loaders: [
-      { test: /\.css$/, loader: "style-loader!css-loader" },
+      { test: /\.css$/, loader: 'style-loader!css-loader' },
       {
         test: /\.jsx?$/,
         exclude: /(node_modules|bower_components)/,
-        loaders: ['react-hot', 'babel']
+        loaders: ['react-hot', 'babel'],
       },
       {
         test: /\.js?$/,
         exclude: /(node_modules|bower_components)/,
-        loaders: ['react-hot']
-      }
-    ]
+        loaders: ['react-hot'],
+      },
+    ],
   },
-  plugins: [
-  ], 
+  plugins: [],
 };