Encode values with trailing whitespace (#24)

These would otherwise be treated ambiguously by tools processing the
resulting LDIF.

This follows RFC 2849 which states:

"Values or distinguished names that end with SPACE SHOULD be
base-64 encoded."

Signed-off-by: Georg Pfuetzenreuter <[email protected]>

Author: tacerus

marshal.go

@@ -145,7 +145,7 @@ func Marshal(l *LDIF) (data string, err error) {
 func encodeValue(value string) (string, bool) {
 	required := false
 	for _, r := range value {
-		if r < ' ' || r > '~' { // ~ = 0x7E, <DEL> = 0x7F
+		if r < ' ' || r > '~' || value[len(value)-1:] == " " { // ~ = 0x7E, <DEL> = 0x7F
 			required = true
 			break
 		}