build: do not require global gulp command

Now contributors don’t need to install `gulp` globally.

Author: shinnn

package.json

@@ -3,13 +3,15 @@
   "version": "0.0.1",
   "description": "The Browsersync website",
   "scripts": {
+    "start": "gulp",
+    "build": "gulp build",
     "test": "gulp build"
   },
   "author": "Shane Osbourne",
   "contributors": [
     "Shinnosuke Watanabe (https://github.com/shinnn)"
   ],
-  "homepage": "https://github.com/BrowserSync/website",
+  "homepage": "https://github.com/BrowserSync/browsersync.github.io",
   "repository": "BrowserSync/browsersync.github.io",
   "license": "ISC",
   "private": true,

readme.md

@@ -1,38 +1,37 @@
 Source code for [browsersync.io](http://browsersync.io/)
 
-##Installation
+## Installation
 
-To contribute, you'll need to fork this repo & install the following system-wide tools:
-
-1. [NodeJS](http://nodejs.org) - use the installer.
-2. [GulpJS](https://github.com/gulpjs/gulp) - `$ npm install -g gulp` (mac users may need to [fix npm permissions](https://docs.npmjs.com/getting-started/fixing-npm-permissions))
+To contribute, you'll need to fork this repo & install [Node](https://nodejs.org/download/).
 
 Next, you need to install the *local* development tools
 
 ```
 $ npm install
 ```
 
-##Development Server + BrowserSync
-As you can probably imagine, this project actually uses BrowserSync along with Gulp, Crossbow & a few other awesome projects
+## Development Server + Browsersync
+
+As you can probably imagine, this project actually uses [Browsersync](https://github.com/browsersync/browser-sync) along with [gulp.js](https://github.com/gulpjs/gulp/blob/master/docs/getting-started.md), [Crossbow](https://github.com/Crossbow-js/crossbow) & a few other awesome projects
 to make development a joy. To experience the awesomeness, just run the following command
 
 ```
-$ gulp
+$ npm start
 ```
 
 This will compile & prefix the `SCSS` files into `CSS`, build the Crossbow site once & launch a browser window to view the site.
 Any changes made to SCSS files will will be auto-injected via BrowserSync & any changes to Markdown or HTML files will cause
 Crossbow to rebuild the site. (in which case, BrowserSync will wait until it's finished & then reload all browsers for you).
 
-##Build
+## Build
+
 This site is compiled with Crossbow, which means you need to `build` it before any
  of your code fixes or typos are displayed on the live site. This is done automatically for you if you 
- use the development environment mentioned above (by running `gulp`) - but if you need to trigger 
+ use the development environment mentioned above (by running `npm start`) - but if you need to trigger 
  it manually for html changes, run...
 
-```bash 
-$ gulp build
+```
+$ npm run build
 ```
 
-Once built, commit all the changes and send you PR :)
+Once built, commit all the changes and send you PR :)