Include interactive channel logging

[Meatballs1]

to log shell activities etc:

looks like:

[*] Logging started: 2015-06-21 17:03:36 +0100

load stdapiload priv��meterpreter�� > getuidServer username: User-PC\User
��meterpreter�� > shellProcess 1508 created.
Channel 1 created.
Microsoft Windows [Version 6.1.7600]
Copyright (c) 2009 Microsoft Corporation.  All rights reserved.

C:\>whoami
user-pc\user

C:\>exit��meterpreter�� > sysinfoComputer        : USER-PC
OS              : Windows 7 (Build 7600).
Architecture    : x86
System Language : en_GB
Domain          : WORKGROUP
Logged On Users : 2
Meterpreter     : x86/win32

[Meatballs1]

I tried changing the on_print_proc to Rex::Ui::Text::Shell's print_line method, but this caused the console to output everything twice.