I also took the chance to refactor the code from a long main method into a couple of functions instead.
Download progress also improved a bit.
Added a new flag (--base_url) to make it possible to use another Base URL instead of the default one.
BUG=None
TEST=Tested on local machine with various
Review URL: https://webrtc-codereview.appspot.com/431003
git-svn-id: http://webrtc.googlecode.com/svn/trunk@1826 4adac7df-926f-26a2-2b94-8c16560cd09d
