Change to go1.6.1 and vendoring

Godeps/_workspace/src/github.com/kr/pty/util.go

@@ -1,35 +0,0 @@
-package pty
-
-import (
-	"os"
-	"syscall"
-	"unsafe"
-)
-
-// Getsize returns the number of rows (lines) and cols (positions
-// in each line) in terminal t.
-func Getsize(t *os.File) (rows, cols int, err error) {
-	var ws winsize
-	err = windowrect(&ws, t.Fd())
-	return int(ws.ws_row), int(ws.ws_col), err
-}
-
-type winsize struct {
-	ws_row    uint16
-	ws_col    uint16
-	ws_xpixel uint16
-	ws_ypixel uint16
-}
-
-func windowrect(ws *winsize, fd uintptr) error {
-	_, _, errno := syscall.Syscall(
-		syscall.SYS_IOCTL,
-		fd,
-		syscall.TIOCGWINSZ,
-		uintptr(unsafe.Pointer(ws)),
-	)
-	if errno != 0 {
-		return syscall.Errno(errno)
-	}
-	return nil
-}