[patch] fix for multi-nested resources

hey ...

this patch fixes 2 bugs i found: when trying to use multi-nested resources & when the nested resource uses has_one or bleongs_to.

for example trying to access something like this: /categories/1/threads/2/posts

would throw out 2 exceptions:

1. method not found for @thread.categories in specification.rb line # 74 (fixed using a respond_to? check first)
2. Ardes::ResourcesController::ResourceMismatch in resources_controller.rb line # 738 (fixed by adding .reverse to the generated enclosing names array)

thanks :)

routing

# accessed /categories
map.resources :categories do |cat|
    # accessed /categories/:category_id/threads
    cat.resources :threads do |thrd|
      # accessed /categories/:category_id/threads/:thread_id/posts
      thrd.resources :posts
    end
end

model associations

category.rb

has_many :threads

thread.rb

belongs_to :category
has_many :posts

post.rb

belongs_to :thread

controllers

categories_controller.rb

resources_controller_for :categories

threads_controller.rb

resources_controller_for :threads, :in => :category

posts_controller.rb

resources_controller_for :posts, :in => [:category, :threads]