Support for online repositories

Description

In our projects we have sometimes dependencies which versions can be faund at online repositories defined as directory. For example rpm repositories or traballs. It could be a good idea if autoupdater could find the newest version in such repository.

Proposal

We could use small python module called htmllistparse which in very simple way can return list of all files in online directory. Then as other types of dependencies treat that list with regex expression defined by user in autoupdater.yml configuration file.