Add collection listing

lib/shopify_api/resources/collection_listing.rb

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+module ShopifyAPI
+  class CollectionListing < Base
+    init_prefix :application
+  end
+end

test/collection_listing_test.rb

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+require 'test_helper'
+
+class CollectionListingTest < Test::Unit::TestCase
+
+  def test_get_collection_listings
+    fake "applications/999/collection_listings", method: :get, status: 201, body: load_fixture('collection_listings')
+
+    collection_listings = ShopifyAPI::CollectionListing.find(:all, params: { application_id: 999 })
+
+    assert_equal 1, collection_listings.count
+    assert_equal 1, collection_listings.first.collection_id
+    assert_equal 'Home page', collection_listings.first.title
+  end
+
+  # def test_get_collection_listing_for_collection_id
+  #   fake "applications/999/collection_listings/2", method: :get, status: 201, body: load_fixture('collection_listing')
+
+  #   collection_listing = ShopifyAPI::CollectionListing.find(2, params: { application_id: 999 })
+
+  #   assert_equal 'Synergistic Silk Chair', collection_listing.title
+  # end
+
+  # def test_get_collection_listing_product_ids
+  #   fake "applications/999/collection_listings/product_ids", method: :get, status: 201, body: load_fixture('collection_listing_product_ids')
+
+  #   product_ids = ShopifyAPI::CollectionListing.product_ids(params: { application_id: 999 })
+
+  #   assert_equal 2, product_ids.count
+  #   assert_equal 2, product_ids.first
+  #   assert_equal 1, product_ids.last
+  # end
+end

test/fixtures/collection_listings.json

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+[
+  {
+    "collection_id": 1,
+    "updated_at": "2017-01-09T13:59:09-05:00",
+    "body_html": null,
+    "default_product_image": null,
+    "handle": "frontpage",
+    "image": null,
+    "title": "Home page",
+    "sort_order": "alpha-asc",
+    "published_at": "2017-01-09T13:59:09-05:00"
+  }
+]