Remove `example/context`

* Remove `example/context` since it is deprecated in LB 3.0

example/context/app.js

@@ -1,36 +0,0 @@
-// Copyright IBM Corp. 2014,2016. All Rights Reserved.
-// Node module: loopback
-// This file is licensed under the MIT License.
-// License text available at https://opensource.org/licenses/MIT
-
-'use strict';
-var g = require('../../lib/globalize');
-var loopback = require('../../');
-var app = loopback();
-
-// Create a LoopBack context for all requests
-app.use(loopback.context());
-
-// Store a request property in the context
-app.use(function saveHostToContext(req, res, next) {
-  var ns = loopback.getCurrentContext();
-  ns.set('host', req.host);
-  next();
-});
-
-app.use(loopback.rest());
-
-var Color = loopback.createModel('color', {'name': String});
-Color.beforeRemote('**', function(ctx, unused, next) {
-  // Inside LoopBack code, you can read the property from the context
-  var ns = loopback.getCurrentContext();
-  g.log('Request to host %s', ns && ns.get('host'));
-  next();
-});
-
-app.dataSource('db', {connector: 'memory'});
-app.model(Color, {dataSource: 'db'});
-
-app.listen(3000, function() {
-  g.log('A list of colors is available at {{http://localhost:3000/colors}}');
-});