Allows arbitrary arguments to VBoxManage export, such as product info (--product, --vendor, etc).

website: update URL for ansible local-playbooks in docs

The old URL wasn't available anymore and returned a 404

Add puppet server provisioner

adding chef-client provisioner

VMWare Workstation 10 driver for Linux

builder/amazon: Fix S3 endpoint URL for instance-store builds

The S3 endpoint URLs don't always include the region name. See:

    http://docs.aws.amazon.com/general/latest/gr/rande.html#s3_region

This mapping is already provided by `goamz` via `region.S3Endpoint`,
so let's use it.