added custom template support, added more ad data, use concurrency

example.hcl

@@ -13,3 +13,8 @@ verbose = true
 # directory where  to store downloaded  ads. kleingebaeck will  try to
 # create it. must be a quoted string.
 outdir = "test"
+
+# template. leave empty to use the default one, which is:
+# Title: %s\nPrice: %s\nId: %s\nCategory: %s\nCondition: %s\nCreated: %s\nBody:\n\n%s\n
+# take care to include exactly 7 times '%s'!
+template = ""