Allow user to override chroot command.
some documentation.
use interactive shell to run build script.
Merge pull request #458 from mwhooker/fixmake

use interactive shell to run build script
packer: default user var values needn't be strings [GH-456]
packer: skip the user var if there was an error
Update builder-amazon-chroot to work with WaitForState changes in 7c56148f
Document permissions required for amazon-chroot build to function.
Merge pull request #460 from bpot/add_iam_role_to_chroot_documentation

website: document permissions required for amazon-chroot build to function.
Merge pull request #459 from bpot/fix_amazon_chroot

builder/amazon-chroot: fix builder-amazon-chroot find states
Update CHANGELOG
communicator/ssh: dir upload works when dir contains symlinks [Gh-449]
pass chroot command to /bin/sh

this allows us to specify an arbitrary chroot command, i.e. for sudo
notes/reorg.
wip
Merge branch 'master' into 430
wip
Revert "notes/reorg."

This reverts commit 73c5aec24d0a504ecfbae038b4b7effb54adb929.

Conflicts:
	builder/amazon/chroot/step_copy_files.go
using blocking cp method.
bugfix.