Quick-and-dirty way to print details of template errors

See Issue #316.

tpl/template.go

@@ -1144,6 +1144,7 @@ func (t *GoHtmlTemplate) AddInternalShortcode(name, content string) error {
 func (t *GoHtmlTemplate) AddTemplate(name, tpl string) error {
 	_, err := t.New(name).Parse(tpl)
 	if err != nil {
+		jww.ERROR.Println(err)
 		t.errors = append(t.errors, &templateErr{name: name, err: err})
 	}
 	return err