Updates README for setting docker0 CIDR
Adds DOCKER0_CIDR config directive to dvm.conf
Updates Vagrantfile to set docker0 CIDR if given

 * bridge_utils needed to be installed
 * docker0 interface needed to be shutdown
 * docker0 interface needed to be deleted
 * args passed to docker needed to be updated
Merge branch 'fix/unable-to-stop-delete-containers' into feature/set-docker0-cidr
Merge branch 'feature/set-docker0-cidr' of https://github.com/yacn/dvm into yacn-feature/set-docker0-cidr

Conflicts:
	Vagrantfile