Update dependencies and relax version specs

loopback 1.x >=1.4.0 (instead of 1.3.x)
loopback-explorer 1.x (instead of ~1.0.0)
loopback-testing 0.x (instead of ~0.0.2)
Merge pull request #3 from strongloop/feature/update-dependencies

Update dependencies and relax version specs
Refactor accessToken handling into User service

Introduce a new service `LoopBack` that holds accessToken and can
provide other LoopBack-related functionality in the future.
Spike: dynamic model resources in Angular

The solutions has several parts:

1. Server-side module

   server/lib/angular-resources.client.js
   server/lib/angular-resources.js

This module provides a middleware (request handler) that returns
Angular module defining $resource objects for all public models
defined in the loopback application.

It should be probably extracted to a new module, e.g. loopback-angular.

2. Server-side integration

One-liner in server/app.js to install the middleware defined above.

3. Client-side changes

Replace 'client/js/services.js' with the script provided by the new
middleware, rename 'starter.services' to 'lbModels' in depedency
configurations.