Configure apt to retry downloads that fail
Configure apt to retry downloads that fail

Fixes #129.

sandstorm-io/vagrant-spk,sandstorm-io/vagrant-spk,ndarilek/vagrant-spk,ndarilek/vagrant-spk,sandstorm-io/vagrant-spk,dwrensha/vagrant-spk,dwrensha/vagrant-spk,dwrensha/vagrant-spk,ndarilek/vagrant-spk