Update default dcos-vagrant-box version to 0.9.2

Update copyright

older statble versions are still available

typo

Support 1.7-open through 1.8.3 (EarlyAccess)

- Restructure the dcos-vagrant.yaml file to include channel

Add platform for distinguishing dev clusters in reported metrics

Ubuntu 16 is now supported on Vagrant 1.8.4

Bump dcos-vagrant-box to 0.6.0

Version 0.6.0

Clarify readme based on recent changes