Add Option for Timeout for Newznab Providers

Hi Ruud,

First off thanks for an amazing piece of software :) 

I run couch on my ds212j which is not the fastest NAS. 
I need to manually change the base.py file after an update to change the http timeout from 30 to 80 for my nas not to error out in the couchpotato logs

is there a way to make it an option ? so that its not reset back to default after every update? 
Thanks :)