Adds webpack-dev-server, updates build instructions

.gitignore

@@ -0,0 +1,2 @@
+/node_modules
+/dist

README.md

@@ -13,5 +13,6 @@ Building
 To build:
 - `npm install`
 - `npm install webpack -g`
-- `webpack`
+- `npm start`
+- navigate to localhost:8080
 

package.json

@@ -4,7 +4,7 @@
   "description": "Example Reach applicaiton using ag-Grid.",
   "main": "dist/ag-grid-react-example.js",
   "scripts": {
-    "test": "echo \"Error: no test specified\" && exit 1"
+    "start": "webpack-dev-server --progress --colors --hot --inline"
   },
   "repository": {
     "type": "git",
@@ -23,12 +23,13 @@
   },
   "homepage": "http://www.ag-grid.com/",
   "devDependencies": {
-    "webpack": "1.12.11",
+    "babel-loader": "6.2.1",
+    "babel-preset-es2015": "6.3.13",
+    "babel-preset-react": "6.3.13",
     "css-loader": "0.23.1",
     "style-loader": "0.13.0",
-    "babel-loader": "6.2.1",
-    "babel-preset-react": "6.3.13",
-    "babel-preset-es2015": "6.3.13"
+    "webpack": "1.12.11",
+    "webpack-dev-server": "^1.14.1"
   },
   "dependencies": {
     "react": "0.14.6",