Change variable naming from "app" to "feathersClient" (#103)

* Change variable naming from "app" to "feathersClient"

This should help people like me who could get confused by having "feathersClient" called "app" but not being able to use it as "app" in feathers (not client) or express.

Regarding: #102

* client instead of feathersClient

readme.md

@@ -24,10 +24,10 @@ In the browser a client that connects to the local server via websockets can be
 <script type="text/javascript" src="//cdn.rawgit.com/feathersjs/feathers-client/v1.1.0/dist/feathers.js"></script>
 <script type="text/javascript">
   var socket = io();
-  var app = feathers()
+  var client = feathers()
     .configure(feathers.hooks())
     .configure(feathers.socketio(socket));
-  var todoService = app.service('todos');
+  var todoService = client.service('todos');
   
   todoService.on('created', function(todo) {
     console.log('Someone created a todo', todo);