fix(update_engine_stub): Avoid a pointless update.conf error.
Merge pull request #25 from marineam/noise

fix(update_engine_stub): Avoid a pointless update.conf error.
fix(libcurl_http_fetcher): use a standard ssl certificate location

Before the update_engine only looked at our self-hosted copy of the
update service. But, other update service's can exist. Let them use a
regular SSL certificate and put it into /etc/certs/ssl.
Merge pull request #27 from philips/new-update-url

fix(libcurl_http_fetcher): use a standard ssl certificate location
fix(*): do a wholesale rename of the dbus interfaces

Replace the org.chromium namespace with com.coreos.update1. This is part
of making it possible to document the "update ready" interface.

Along the way this commit also removes a number of interfaces that we
don't plan to support such as setting channel and track over dbus.