Add Windows post module for reading/searching Outlook e-mail

This module allows to read and search e-mails present in Outlook installations. It is using powershell in order to search the e-mails.

When connecting to Outlook using powershell, a security popup appears. WinAPI is used to automatically click on the popup, so access is allowed.

This module is tested on Windows 8.1 x64 with Outlook 2013.
I think we should convert this one to a switch statement:
```
case action.name
when 'LIST'
    print_good('Available folders in the mailbox: ')
    listBoxes
when 'SCAN'
    readEmails(folder,keyword,object,atrans,acftrans)
else
    print_error("Unknown Action: #{action.name}")
end
```