Added ability to apply array to option 'as' of the Routing Mapper

Added ability to use an array of names to create multiple url helpers for one url route.

```ruby
#config/routes.rb
get 'homes', to: 'homes#index', as: [:home, :homes]
```

```
$ rake routes
home GET    /homes(.:format)  homes#index
homes GET    /homes(.:format) homes#index
```