Easy File Management Web Server v5.3 Stack Buffer Overflow

Tested module on:
Microsoft Windows XP
Microsoft Windows 7
Microsoft Windows 8
May I suggest we use `unless` for negative checks?
```
unless check == Exploit::CheckCode::Appears
  fail_with(Failure::NoTarget, "#{peer} - Target does not appear to be running fmws 5.3")
end
```
Also, what do you want to do in the case of version `4.0`? Do you want to go ahead and attempt the exploit anyway?

You'll need to make changes to your local branch and push the changes back up to github, the PR will automatically update.

Thanks!