builder/amazon: configurable virtualization type

Fix ansible paths when provisioning Linux from Windows

implemented null buider

optionally use existing ssh key for amazon builders

Updates googlecompute build to v1 API & uses boot persistent disk

builder/vmware-vmx: add cloning support on Windows [GH-824]

Update Ansible provisioner to set cwd to staging directory.

Properly return error when invalid instance state is found

fixing colored output of Makefile

common: fix error handeling when creating a floppy

builder/digitalocean: updated default image_id, fixes #1032

builder/digitalocean: updated default image_id, per #1032

use old ssh code until higebu's branch (#1030) is ready, see #1019

Changing to the v1 google-api-go-client. Now creates a persistent disk as the boot disk, and sets it to auto delete

The colored output is broken when using Zsh.

\033[32;01m==> Installing dependencies\033[0m
\033[32;01m==> Building\033[0m

After adding the parameter -e to echo I get the expected green lines.

The null builder is not really a bulider, it just setups a SSH
connection and runs the provisioners. It can be used to debug
provisioners without incurring high wait times. It does not create any
kind of image or artifact.