chore(*): add warning about serial logging performance
Merge pull request #109 from jonboulle/master

chore(*): add warning about serial logging performance
fix(README): bump the required version numbers

Based on feedback on the mailing list recommend vagrant 1.6 and virtualbox 4.3.10
feat(Vagrantfile): alter configuration to allow use as Docker host vm

turning off guest additions and vboxsf makes this possible, which is taken directly from the default docker host configuration: https://github.com/mitchellh/vagrant/blob/master/plugins/providers/docker/hostmachine/Vagrantfile
feat(channel): Allow user to configure CoreOS update channel
Merge pull request #102 from bcwaldon/configurable-channel

feat(channel): Allow user to configure CoreOS update channel
if exposing docker api locally use a unique port for each box in the cluster
Merge pull request #104 from ddollar/unique-port-forward

if exposing docker api locally use a unique port for each box in the cluster
Merge pull request #115 from shopkeep/allow-docker-host-vm

feat(Vagrantfile): alter configuration to allow use as Docker host vm