Dont' report HTTPS comms errors when HTTP doesn't work either

git-svn-id: https://plugins.svn.wordpress.org/vaultpress/trunk@1044657 b8457f37-d9ea-0310-8a92-e5e31aec5664
Release plugin version 1.6.8

git-svn-id: https://plugins.svn.wordpress.org/vaultpress/trunk@1044658 b8457f37-d9ea-0310-8a92-e5e31aec5664