Add support for AWS provider

Added AWS support. Needed to upgrade Vagrantfile to v2 spec, as well
changes to reflect default ‘ubuntu’ user for AWS Ubuntu AMIs. Calling
bootstrap script as default user (not privileged) and updated those
scripts to reflect new context.
Rework for AWS on Windows.
Typo
Get vbox name from env variable if set.  Pull provision dir in AWS from master.
Use sudo for APPDIR creation.