RFC: expose a seam for TransportDecorator.

Add disk_type for google compute, courtesy @meatballhat

Merge branch 'googlecompute-disk-type' of https://github.com/meatballhat/packer into f-google-disk-type

Update setup.html.markdown

WinRM exposes an HTTP transport decorator that can be used for different
authentication schemes.  Windows on Azures requires this if one is to use
the out of the box configuration.

zip file now contains a single binary

Add example of extra_arguments

Closes #3326

Add a note about timezone "-0700" in "isotime".

Put shell provisioner doc in 'packer fix' order

Ansible: add the support for specifying ansible_user

Closes #3273

Ansible: don't use deprecated ssh options when ver above 2.0

Ansible 2.0 deprecated ansible_ssh_user, ansible_ssh_port, ansible_ssh_host
instead use ansible_user, ansible_port, and ansible_host in the
inventory file.

Closes #3275

Fixing broken link in OpenStack builder docs

Make communicator's WinRM defaults more intuitive when using SSL.

fix assign to driveArgs

Signed-off-by: Vasiliy Tolstov <v.tolstov@selfip.ru>

This reverts commit 3b8f0023.

builder/qemu: fix drive args

Ansible: os.Environ() should always be passed to the ansible command.

Fixes GH-3271

Regression introduced in GH-3203