Correct initialisms as suggested by golint

First step to use initialisms that golint suggests,
for example:

    Line 116: func GetHtmlRenderer should be GetHTMLRenderer

as see on http://goreportcard.com/report/spf13/hugo

Thanks to @bep for the idea!

Note that command-line flags (cobra and pflag)
as well as struct fields like .BaseUrl and .Url
that are used in Go HTML templates need more work
to maintain backward-compatibility, and thus
are NOT yet dealt with in this commit.

First step in fixing #959.

target/page.go

@@ -16,7 +16,7 @@ type PagePublisher interface {
 }
 
 type PagePub struct {
-	UglyUrls         bool
+	UglyURLs         bool
 	DefaultExtension string
 	PublishDir       string
 }
@@ -46,7 +46,7 @@ func (pp *PagePub) Translate(src string) (dest string, err error) {
 		dir = filepath.Join(pp.PublishDir, dir)
 	}
 
-	if pp.UglyUrls || file == "index.html" || file == "404.html" {
+	if pp.UglyURLs || file == "index.html" || file == "404.html" {
 		return filepath.Join(dir, fmt.Sprintf("%s%s", name, ext)), nil
 	}
 

target/page_test.go

@@ -74,7 +74,7 @@ func TestTranslateUglyUrls(t *testing.T) {
 	}
 
 	for _, test := range tests {
-		f := &PagePub{UglyUrls: true}
+		f := &PagePub{UglyURLs: true}
 		dest, err := f.Translate(filepath.FromSlash(test.content))
 		if err != nil {
 			t.Fatalf("Translate returned an unexpected err: %s", err)