Fix support for deprecated author fields

Should add an author if either name or email is specified.

app.go

@@ -81,7 +81,7 @@ func NewApp() *App {
 
 // Entry point to the cli app. Parses the arguments slice and routes to the proper flag/args combination
 func (a *App) Run(arguments []string) (err error) {
-	if a.Author != "" && a.Author != "" {
+	if a.Author != "" || a.Email != "" {
 		a.Authors = append(a.Authors, Author{a.Author, a.Email})
 	}