packer: better error message for bad provisioner only/except
website: document `only` and `except`
provisioner/puppet-masterless: user variables in puppet vars [GH-448]
packer/plugin: log git commit plugin was built against
packer/plugin: detect invalid versions
Add updatedeps to .PHONY list in Makefile
Add clean to .PHONY list in Makefile
make updatedeps updates the core deps too
scripts: build.sh compiles all Packer components in parallel
scripts: PACKER_NO_BUILD_PARALLEL to build in sequence
v0.3.8
Update version for dev
fix variable name
Merge pull request #457 from CpuID/master

website: fix variable name
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.