The same as collection/3 but does not require a block passed in

defines a collection scope based on :item_scope passed in to opts. A camelized module is generated from the collection_name. the :item_scope is used to generate a css selector scope that queries and actions defined within the block can use.

The module generates 2 functions for querying the items in the collection:

all which returns all items in the collection and get(index) which returns the item at passed index

## Example

  defmodule MyPage do
    # make the collection macro available via PageObject
    use PageObject

    collection :menu_items, item_scope: ".menu .item" do
      # all DOM related query and action macros called here will have their selectors scoped to ".menu .item"
      # and will be available as methods on the generated collection module: `MyPage.MenuItems`
      clickable :click, "a"
    end
  end

  # test usage
  test "I can logout by clicking the last menu item" do
    # get the last menu item
    MyPage.MenuItems.all
    |> List.last
    # most scoped and queries with scope take a Hound Element as the first argument
    |> MyPage.MenuItems.click
  end