Use ARK for managing binary install

ark installs and managees the tarballs from remote sources, using the
coreos releases published to github by deefault
remove binary location atttribute

This isn't being used for now.
service doesn't need to install curl anymore
binary install asseembles git url from version attribute
fixed path to the etcd bin for now
update tests to use full path to etcdctl
start the changelog
now that there aree deps push the berks lock