Remove ssh_wait_timeout from doc basic examples for virtualbox/vmware…

The default image name in the code has a bug. It is being set to packer-{{timestamp}}, the {{timestamp}} part needs to be interpolated. Without the interpolation the GCE builder fails with
the following error

==> googlecompute: Creating image...
==> googlecompute: Error waiting for image: googleapi: Error 400: Invalid value for field 'resource.name': 'packer-{{timestamp}}'. Must be a match of regex '(?:[a-z](?:[-a-z0-9]{0,61}[a-z0-9])?)', invalid

Add 'edit these docs' link in the website footer

Wrap SSH handshake in a timeout

Fix #2830.

wesbtei: Fix NULL builder config documentation.

Change from "host" to "ssh_host" was introduced in d545431f

Fix `packer build` reading from STDIN

Signed-off-by: Jesse Szwedko <jesse.szwedko@getbraintree.com>

helper/config: copy buildname/buildtype properly

website: Be more explicit about sequence definition usage in docker builder docs

Document shell provisioner example for FreeBSD

Detect the first public IPv4 address for Digital Ocean

builder/googlecompute: default SSH settings properly [GH-2340]

builder/amazon/instance: set valid bundle prefix [GH-2328]

builder/amazon: output WinRM password for debug mode [GH-2336]

packer: validate minimum version [GH-2310]

Fix flags so we can do e.g. -only=build1,build2