Adding images to scraping data (#157)

* Fredy now supports pulling the main Image from the listing and send it together with the usual information

lib/provider/kleinanzeigen.js

@@ -32,6 +32,7 @@ const config = {
     link: '.aditem-main .text-module-begin a@href | removeNewline | trim',
     description: '.aditem-main .aditem-main--middle--description | removeNewline | trim',
     address: '.aditem-main--top--left | trim | removeNewline',
+    image: 'img@src',
   },
   normalize: normalize,
   filter: applyBlacklist,