Item.download and other file download interfaces should expose a timeout option for requests

[pgulley]

Hello!
I'm working on a project which requires downloading very large files from the IA collections- some of which fail to return any data in the 12 second timeout window that's hard coded into the file.download interface.
It would be a huge boon if I could specify a larger timeout window when calling item.download(...) as the only other option available to me right now is to break out the url and manually complete the request.

[vxbinaca]

I ran into this on the last major outage @jjjake and would like a way to configure the timeout to wait, now the normal waits on tubeup don't apply because this is a search timeout I encountered but it's value is 12. Now uploading would have failed anyway even if search worked, and the entire site was down, but this still killed rips instead of patiently waiting in line.

If Paiges request gets a configurable timeout, it'd be nice if search would get this too.