Bundle update

Bundle updated:

* Adapt rspec3.0.0beta1
 * Fixed deprecation warning
 * new syntax with transpec
* And some minor stuffs.

I actually also tried to bumped up rails to 4.0.2.
But some of the tests are not passed like these.

```
 12) StarsController POST create when star record is not found should return http success
     Failure/Error: post :create, valid_attributes
     ActionController::UrlGenerationError:
       No route matches {:message_id=>"1", :controller=>"stars", :action=>"create"}
```

I guess it's related with this issue(https://github.com/rails/rails/issues/12751) and will be fixed at 4.0.3.
Could you have a look of these changes? @KitaitiMakoto