[MERGE] Added ability to pass output file object to cmd_send.

[John Arbash Meinel]

Monty Taylor wrote:
> Here's a really small one that lets you pass in a file-like object to
> cmd_send. This can be helpful for writing plugins that would like to
> call cmd_send and intercept the output and use it for something else.
> 

BB:resubmit

I agree with Robert that this should be done at a different level. I 
generally think re-using cmd_foo for anything but inheriting and 
overriding means there is too much stuff in the command class, which 
should be in helper functions.

John
=:->