Provide more thorough usage example

The new usage example now shows more than just initializing middleware,
in order to demonstrate how some middlewares must be injected with the
request and response objects from the socket upon execution,
e.g. passport.authenticate()

Author: busterc

README.md

@@ -1,4 +1,4 @@
-# ious [![NPM version][npm-image]][npm-url] [![Build Status][travis-image]][travis-url] [![Dependency Status][daviddm-image]][daviddm-url] [![Coverage percentage][coveralls-image]][coveralls-url]
+# ious [![NPM version][npm-image]][npm-url] [![Build Status][travis-image]][travis-url] [![Dependency Status][daviddm-image]][daviddm-url]
 > use express middleware on socket.io namespaces
 
 ## Installation
@@ -18,13 +18,55 @@ var ious = require('ious')(io);
 
 // some friendly connect/express middlewares
 var cookieParser = require('cookie-parser');
-var passport = require('passport'); // <- i recommend using the JWT strategy
+var passport = require('passport');
+var JwtStrategy = require('passport-jwt').Strategy;
 
-// this is how we do it
+passport.use(new JwtStrategy({
+  secretOrKey: 'YourSecretIsSafeWithMe',
+  jwtFromRequest: function(request) {
+    var token = null;
+    if (request && request.cookies) {
+      token = request.cookies.jwt;
+    }
+    return token;
+  }
+}, function (credentials, done) {
+  // something like this
+  require('./user').findOne({ id: credentials.userId }, function(error, user) {
+    if(error) {
+      return done(error);
+    }
+    if(user) {
+      return done(null, user);
+    }
+    done(null, false);
+  });
+}));
+
+// now we're cooking with fire
 ious(cookieParser());
 ious(passport.intialize());
 
 // carry on...
+
+io.on('connection', function (socket) {
+  // only allow admin roles on this handler
+  socket.on('do something as an admin', function (callback) {
+    passport.authenticate('jwt', function (error, user, info) {
+      if (error) {
+        return callback(error);
+      }
+      if (info instanceof Error) {
+        return callback(info);
+      }
+      if (!user || user.role !== 'admin') {
+        return callback('User Not Authenticated');
+      }
+      // user is authenticated and authorized
+      return require('./admin').doSomething(callback);
+    })(socket.request, socket.request.res, callback);
+  });
+});
 ```
 ## License
 
@@ -37,5 +79,3 @@ ISC © [Buster Collings](https://about.me/buster)
 [travis-url]: https://travis-ci.org/busterc/ious
 [daviddm-image]: https://david-dm.org/busterc/ious.svg?theme=shields.io
 [daviddm-url]: https://david-dm.org/busterc/ious
-[coveralls-image]: https://coveralls.io/repos/busterc/ious/badge.svg
-[coveralls-url]: https://coveralls.io/r/busterc/ious