Formatting fixes. Add more shortcuts

lib/paapi/item.rb

@@ -9,10 +9,26 @@ module Paapi
       get(['ASIN'])
     end
 
+    def detail_url
+      get(['DetailPageURL'])
+    end
+
+    def image_url
+      get(%w{Images Primary Large Height URL})
+    end
+
     def title
       get(%w{ItemInfo Title DisplayValue})
     end
 
+    def contributors
+      get(%w{ItemInfo ByLineInfo Contributors})
+    end
+
+    def authors
+      a = contributors.select { |e| e['Role'] == 'Author' }.map { |e| Nameable(e['Name'])}
+    end
+
     def release_date
       get(%w{ItemInfo ReleaseDate})
     end
@@ -33,12 +49,12 @@ module Paapi
       get(%w{ItemInfo ManufactureInfo ItemPartNumber DisplayValue})
     end
 
-    def format
+    def package
       get(%w{ItemInfo TechnicalInfo Formats DisplayValues})
     end
 
     def kindle?
-      !format.nil? && format&.include?('Kindle eBook')
+      !package.nil? && package&.include?('Kindle eBook')
     end
 
     def get(keys)