Add contribution guidance

Add CONTRIBUTING.md that points to the same document in chef-cookbooks
Add mention of the contribution document in the top of the README.md
Merge pull request #35 from claco/contributing

Merged automatically by jenkins after successful build test
version bump
Version Bump to 4.1.3
Merge pull request #36 from rackerjoe/master

Version Bump to 4.1.3
add a version file
Merge pull request #37 from rackerjoe/master

Merged automatically by jenkins after successful build test
make metadata.rb read the VERSION file
Merge pull request #38 from rackerjoe/master

Merged automatically by jenkins after successful build test
Merge branch 'havana' of github.com:rcbops-cookbooks/exerstack

Conflicts:
	metadata.rb
use global 'region' attr
Merge pull request #39 from invsblduck/issue593_region

Merged automatically by jenkins after successful build test