These changes permit the use of pre-created SSH keypairs with AWS. If
so, the configuration for the builder needs to include an
ssh_keypair_name option and a ssh_private_key_file.

If ssh_private_key_file is *not* defined, it'll go through the
rigamarole of creating a temporary keypair. The ssh_keypair_name option
by itself won't make that change, because it doesn't make sense to
specify a keypair but not tell packer where the private key is, but it
does happen that you could have a private key and the public-key is
"baked in", and not part of your EC2 account.

Adds a 'ssh_keypair_name' option to the configuration
for AWS, along with some munging to create the
temporarily keypair if one isn't specific.

NOT YET WORKING.

From a 'make' I get the following errors:

builder/amazon/ebs/builder.go:94: b.config.SSHKeyPairName undefined
(type config has no field or method SSHKeyPairName)

builder/amazon/instance/builder.go:199: b.config.SSHKeyPairName
undefined (type Config has no field or method SSHKeyPairName)

Fix documentation for openstack_provider and provider config options. 
[skip ci]

builder/parallels: Use most recent DHCP lease when determining IP.

Update plugins.html.markdown

I think this is the required PATH for windows.

Fix amazon instance type on build an image page [skip ci]

[skip ci]

Add `--retcode-passthrough` to salt-call so the build fails when there is an error running `highstate`

This page referred to using a "t1.micro" instance but the template actually uses a "t2.micro".

Create temporary copy of symlink before uploading, fixes #1765

Updated Amazon documentation to reflect use of credentials file
[skip ci]

Allow manifest_file to be a directory for Puppet Masterless Porvisioner

Fix link to shell provisioner [skip ci]

Escapes cp alias, fixes #1656

Changed type of version.number / vagrant-cloud post-processor
Fixes #1735 

Added Chocolatey as alternative installation [skip ci]

Fix typo: One attached -> Once attached [skip ci]

Fixes #1746. Problem establishing SSH connection with Fedora 21 and
Parallels

A few weeks ago ... the version.number changed from an integer to a
semver based string.

I guess version.number and version.version are equals now. So
version.version can be used.

This commit should fix #1735

fix passing bootstrap_args to bootstrap script (issue #1235)

Updated Amazon documentation to reflect the precedence rules putting ~/.aws/credentials files ahead of env vars. Ref #1612

update default output to reflect current packer release

Updated the spot price docs