WIP: pkg/deploy/gce: lib + web wizard to deploy on Google Cloud

http://camlistore.org/issue/531

Change-Id: I47900eb7b82b7775ec1d26b1d6796e5701ee672d
wip on pkging

Change-Id: Ic8fe9879dd078c1c5aaf7b9facf8a4718a35dea6