Extract HDS stream URLs
Refactor stream classes
Fix HDS URL
Download HDS streams using AdobeHDS.php
Refactoring: use ExternalDownloader for all sources
--protocol argument for selecting between rtmp and hds

Default to rtmp
README
remove obsolete code, move global functions to classes
README
Generate unique filenames also for HDS and HTTP downloads
Memoize output filename
Sometimes only HDS streams can be downloaded