sync with current Go (gofix go1rename, error)

output.go

@@ -20,17 +20,16 @@ package markdown
 // HTML output functions
 
 import (
-	"os"
 	"fmt"
 	"log"
-	"rand"
+	"math/rand"
 	"strings"
 )
 
 type Writer interface {
-	WriteString(string) (int, os.Error)
-	WriteRune(int) (int, os.Error)
-	WriteByte(byte) os.Error
+	WriteString(string) (int, error)
+	WriteRune(int) (int, error)
+	WriteByte(byte) error
 }
 
 type htmlOut struct {
@@ -76,7 +75,6 @@ func (w *htmlOut) s(s string) *htmlOut {
 	return w
 }
 
-
 /* print string, escaping for HTML  
  * If obfuscate selected, convert characters to hex or decimal entities at random
  */
@@ -231,7 +229,6 @@ func (w *htmlOut) elem(elt *element, obfuscate bool) *htmlOut {
 	return w
 }
 
-
 func (w *htmlOut) printEndnotes() {
 	counter := 0