providers/aws: Ignore transient network errors when fetching AWS state.

website: Update example to match parameter.

provisioner/ansible: Colorize Ansible output, and don't buffer output.

provisioner/shell: single quote env var values.

Setting environment variables for the ansible-playbook invocation.

ANSIBLE_FORCE_COLOR will ensure output is colorized.  PYTHONUNBUFFERED will stream output as Ansible runs, vs getting a big dump of output at the end.

The example showed "path" instead of "output".

Given that state fetching is an idempotent operation, a transient
network error should not cause the entire build to fail. Instead,
retry when such errors are encountered.

fix a minor typo in platforms.html

fix: Respect metadata supplied for GCE builders.

Fixed dead links in doc section environment-variables.

Use middleman-hashicorp

Previously, any per instance metadata supplied via the GCE builder
was ignored.

Test plan:

- make test
- Manual testing via:
-- Created a packer config that contained a GCE builder with custom
   metadata set.
-- Ran `packer build`.
-- Verified the instance had the correct metadata in the GCE console.

builder/parallels: Create VM without hdd and then add it later

builder/parallels: Rely on Cleanup functions to detach devices

This is needed to make 'cdrom0' device unavailable during the ISO installation process.
It is required for some guest OS types, such as FreeBSD and OmniOS.

CD/DVD drive with installation ISO should be exactly the 2nd device in the VM boot order.
This ensures that VM will boot from this ISO at the first boot time only.

For each ISO image the individual cdrom device will be added to the VM. During the cleanup these devices will be deleted.
It makes attach steps more clear - there is no doubt what is the name of the device.

Related to: [mitchellh/packer#1502]

Remove the redundant StepRemoveDevices and rely on the cleanup to be handled by:
* StepAttachParallelsTools.Cleanup
* StepAttachFloppy.Cleanup
* stepAttachISO.Cleanup

Update website to use latest middleman

builder/parallels: Ignore 'The fdd0 device does not exist'

Avoid the disk resize because it is unsupported for some guests (OS X)
http://kb.parallels.com/en/113653

builder/parallels: Bundle python version of prltype

Due to a missing `/` the links pointed to i.e. `docs/other/docs/other/core-configuration.html` producing a 404 / Page not found.

Uses the Python API from Parallels Virtualization SDK to write
boot commands.

This eliminates a 3rd party requirement and makes it easier for people
not using homebrew to get started with packer.