Added the url modules test files.

Added the new url module test file. This replaces the original
helpers_test.go file.

The TestUrlPrep test currently fails.

The only minor change to url.go is to add some trace printf's to
UrlPrep.

helpers/url.go

@@ -81,6 +81,7 @@ func MakePermalink(host, plink string) *url.URL {
 func UrlPrep(ugly bool, in string) string {
 	if ugly {
 		x := Uglify(SanitizeUrl(in))
+		fmt.Printf("Ugly case. Returning x = %q\n", x)
 		return x
 	} else {
 		x := PrettifyUrl(SanitizeUrl(in))
@@ -89,8 +90,10 @@ func UrlPrep(ugly bool, in string) string {
 		}
 		url, err := purell.NormalizeURLString(x, purell.FlagAddTrailingSlash)
 		if err != nil {
+			fmt.Printf("ERROR returned by NormalizeURLString. Returning in = %q\n", in)
 			return in
 		}
+		fmt.Printf("NO error returning url = %q\n", url)
 		return url
 	}
 }