builder/virtualbox/iso: load shutdown config [GH-754]
packer/rpc: ignore non-existent streams in muxconn
provisioner/ansible-local: templates for role, playbook paths [GH-749]
builder/vmware/*: can specify path to fusion [GH-677]
packer: template now handles user var logic
packer/rpc: build updated to use new interface
update commands to new user var syntax
packer: template process build names [GH-744]
packer: delete pause_before to avoid template invalids [GH-759]
packer/rpc: make buffer real big for writes [GH-755]
builder/docker: customize run command [GH-648]