Update vagrant-hosts for 1.1
Remove localhost hacks
Add in autoconfiguration

if no hosts are specified at the time of provisioning, or the
`autoconfigure` option is true, the provisioner will look up all private
network addresses for the vagrant machines and use them.
Use vagrant built in host name changing
Update README
Deduplicate private call in provisioner
Reword readme
Bump version
Merge branch 'vagrant-1.1'