Add support for blogs that require login.

[RafayGhafoor]

The script doesn't allow to scrap blogs with privacy enabled. A bypass for this would be to use mechanize module to first log-in and then execute the script or using selenium or phantomjs (if there's any js involved).

p.s. also consider seeing this gist which requires [requests] for performing the given task.

https://gist.github.com/zhanglongqi/faf747ec5406997683ee