Added user authentication and refactored routes.

Also removed a badly written controller spec, since it was causing problems. Will rewrite it when with the other specs.
We usually use `get :delete` instead of `get :confirm_destroy`.

Also, it would be nice to remove routes that you don't use here. For example:

```ruby
resources :standups, :only => [:index, :create, :destroy] do
...
end
```