Add a force update action, that forces the addon to always update

[cpw]

Some addons don't change version numbers. /me shakes tiny fist at The Undermine Journal

[ephraim]

please change your commit to just clear the version field in the addonList to None and then call self.updateAddon. I prefer this way, cause the code of updating an addon isn't doubled then. And btw. your "addon" list when saving includes the addon twice afaiks once from the append at checkforupdate and then the second append before the actual update.

[cpw]

I just duplicated "updateAddon" to pass none to the addon check.

[ephraim]

Checkout latest commit.