Updated website for vmware workstation support, fixes #221/#222
packer: use locks/conds to avoid races on RemoteCmd.Exited [GH-42]
packer/rpc: Use the SetExited for remote communicators
communicator/ssh: use SetExited
packer: Use ch for condition variable

Thanks @titanous I didnt know this worked.
packer/plugin: more stable stderr logging
packer/plugin: clean up stderr
packer/plugin: use chan struct{} for condition variable behavior
packer/plugin: flush os.Stderr whenever a plugin ends
add tests files to everything to test compilation
builder/amazon/chroot: boilerplate
builder/amazon/chroot: rename to builder-amazon-chroot
builder/amazon/chroot: verify we're on an EC2 instance
builder/amazon/chroot: extract the source AMI info
builder/amazon/chroot: create the volume
builder/amazon/chroot: step to gather instance info
builder/amazon/chroot: delete the EBS volume after we're done
builder/amazon/common: generic wait for state to wait for any state
builder/amazon/chroot: wait for volume to beecome ready
builder/amazon/chroot: Attach volume