Add a clean_ami_name template function which will translate illegal
characters in an AMI name to '-'. Example usage would be:
    "ami_name": "Ubuntu 12.04 {{isotime | clean_ami_name}}"

builder/virtualbox: Using the vm_name parameter to name OVA/OVF files and their attachments

builder/amazon/all: AMI region copy fixes

Conflicts:
	packer/config_template.go

website: minor URL typo

URLs with special characters should escape them.

/cc @whostolebenfrog - I actually simplified things quite a bit. I added
a "uuid" global template function so it just uses that now. I renamed it
so that it is clear it is a temporary keypair.

builder/amazon/ebs: Allow customization of temporary ssh key name

builder/virtualbox: Add `hard_drive_interface` option

Defined in a template using ssh_keypair_pattern. Defaults to "packer %s"

Otherwise we get stuck in a long loop. Whoops.