Updater - keep your GetSimple installation and plugins up to date

[mvlcek]

it works for more plugins for me now, but not for all:
i18n_base.php disabled Upgrade Check Failed ! disabled
i18n_navigation.php disabled Upgrade Check Failed ! disabled

These will continue to fail, as it's two plugin files packed into one zip (with a different name) - because of technical reasons. But in the meantime I have found some workarounds around the limitations of GetSimple, so I might try to merge them again.