gosh does not support golang 1.8 or higher

[kklipsch]

Go 1.8 and greater changed the behavior of os.Rename such that it will now fail if you are trying to rename to a destination that already exists. We are doing so because we are using the temporary folder libraries to get atomically unique names and then renaming into the directories that get created.

We can:

• use TempDir and delete the folder it creates, losing atomic names
• make our own atomically random temp dir name function
• figure out how to move into the folder correctly instead of rename