Extended the IInstallerFactory.CreateInstaller with a parameter that allows a looser binding between installers and update authority components.
Added class UpdateAlwaysAuthority, impmplementing IUpdateAuthority by instructing clients to update all packages on every call.
Added class UpdateOnIntervalAuthority, implementing IUpdateAuthority and reporting about outdated packages after a specified time.
Merge branch 'develop' of https://github.com/per-samuelsson/GoodGet into develop