Clean up Say statements.

Correct behavior for undefined recipe list.
Correct package name to upstream repo.

Conflicts:
	config.go

Add the chef-solo provisioner back to config.go.
Fix import path for chef-solo provisioner.

Fix typo in packer.go

website: Just fixing a small error in the text.

The sentence was missing a few words.
I've made it read similar to the previous 3 sentences.

provisioner/shell: execute script directly instead of using /bin/sh

/cc @sgirones