Instanciate common attributes everywhere so one can simply use the extend method

generator.go

@@ -16,7 +16,10 @@ type Generator struct {
 
 // NewGenerator creates a new Generator. It returns a *Generator.
 func NewGenerator(text string) *Generator {
-	return &Generator{Text: html.UnescapeString(text)}
+	return &Generator{
+		CommonAttributes: newCommonAttributes(),
+		Text:             html.UnescapeString(text),
+	}
 }
 
 // Check checks the Generator for incompatibilities with RFC4287. It returns an