Move chef-vault into omnibus-chef

This software formerly lived in omnibus-software, but was failing tests because
it has dependencies on the softwares in omnibus-chef.
Merge pull request #206 from opscode/sethvargo/chef-vault

Move chef-vault into omnibus-chef
Update omnibusses to latest masters.
Remove resources_dir
Use windows? platform check
Add source_dir
Remove source_dir (not a dsl command)
Use Config.source_dir