fix(contrib): add --insecure-registry flag for docker 1.3.2

Deis' registry is insecure. Docker is secure-by-default, which means
that we must now whitelist insecure registries on each and every daemon.
Does this network range make sense to include by default? This isn't the range used for local dev registry (192.168.*) and some cloud providers, although it should cover EC2. I'm concerned it won't cover enough by default to be useful.