Deprecate windows persistence post module in favor of local exploit module

Deprecation date set as Nov 12, 2013. Verification steps:

```
> use post/windows/manage/persistence
> set LHOST 1.1.1.1
> set LPORT 5555
> set SESSION 1
> run
```

- [ ] Ensure that you get a large "This module is deprecated" banner in the console output