Rearrange example scripts and tools

_tools/erasing.go

@@ -1,20 +0,0 @@
-package main
-
-import "github.com/c-bata/go-prompt"
-
-func main() {
-	l := 20
-	out := prompt.NewStandardOutputWriter()
-	out.EraseScreen()
-	for i := 0; i < l; i++ {
-		out.CursorGoTo(i, 0)
-		out.WriteStr("XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX")
-	}
-
-	out.CursorGoTo(5, 10)
-	out.EraseLine()
-
-	out.CursorGoTo(l, 0)
-	out.Flush()
-	return
-}