Support unmarshaling of "uuid" type

Allows unmarshaling of CQL "uuid" values in addition to the existing
"timeuuid" support. Only "timeuuid" may be unmarshaled to time.Time
values, however.

Also adds a test for this type.

marshal.go

@@ -86,6 +86,8 @@ func Unmarshal(info *TypeInfo, data []byte, value interface{}) error {
 		return unmarshalMap(info, data, value)
 	case TypeTimeUUID:
 		return unmarshalTimeUUID(info, data, value)
+	case TypeUUID:
+		return unmarshalUUID(info, data, value)
 	case TypeInet:
 		return unmarshalInet(info, data, value)
 	}
@@ -912,13 +914,19 @@ func marshalUUID(info *TypeInfo, value interface{}) ([]byte, error) {
 	return nil, marshalErrorf("can not marshal %T into %s", value, info)
 }
 
-func unmarshalTimeUUID(info *TypeInfo, data []byte, value interface{}) error {
+func unmarshalUUID(info *TypeInfo, data []byte, value interface{}) error {
 	switch v := value.(type) {
 	case Unmarshaler:
 		return v.UnmarshalCQL(info, data)
 	case *uuid.UUID:
 		*v = uuid.FromBytes(data)
 		return nil
+	}
+	return unmarshalErrorf("can not unmarshal %s into %T", info, value)
+}
+
+func unmarshalTimeUUID(info *TypeInfo, data []byte, value interface{}) error {
+	switch v := value.(type) {
 	case *time.Time:
 		id := uuid.FromBytes(data)
 		if id.Version() != 1 {
@@ -926,8 +934,9 @@ func unmarshalTimeUUID(info *TypeInfo, data []byte, value interface{}) error {
 		}
 		*v = id.Time()
 		return nil
+	default:
+		return unmarshalUUID(info, data, value)
 	}
-	return unmarshalErrorf("can not unmarshal %s into %T", info, value)
 }
 
 func unmarshalInet(info *TypeInfo, data []byte, value interface{}) error {

marshal_test.go

@@ -7,6 +7,7 @@ import (
 	"strings"
 	"testing"
 	"time"
+	"tux21b.org/v1/gocql/uuid"
 )
 
 var marshalTests = []struct {
@@ -49,6 +50,11 @@ var marshalTests = []struct {
 		[]byte(nil),
 		[]byte(nil),
 	},
+	{
+		&TypeInfo{Type: TypeTimeUUID},
+		[]byte{0x3d, 0xcd, 0x98, 0x0, 0xf3, 0xd9, 0x11, 0xbf, 0x86, 0xd4, 0xb8, 0xe8, 0x56, 0x2c, 0xc, 0xd0},
+		uuid.FromBytes([]byte{0x3d, 0xcd, 0x98, 0x0, 0xf3, 0xd9, 0x11, 0xbf, 0x86, 0xd4, 0xb8, 0xe8, 0x56, 0x2c, 0xc, 0xd0}),
+	},
 	{
 		&TypeInfo{Type: TypeInt},
 		[]byte("\x00\x00\x00\x00"),