Fixing the updater

Now

• use load-0.86 so that old .jar files are ignored.
• sign new webstart starter with new cert
• create release for 0.86.1 with new cert
• only use 0.86.1 for webstart

• add server configurable message on outdated.

Live

• update webstart starter
• update-0.86.properties
• provide 0.86.1 files with new cert in updater location.

Later

• provide 0.86.1 download signed with new key

0.87

• make sure that games.stendhal.client.update is not included in the diff files for the old updater
• make sure that META-INF
• provide two update diffs (one with the old cert and one with the new cert)
• update.properties pointing to the ones with the old cert
• update-0.86.properties pointing to the ones with the new cert