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 #130 from claco/contributing

Merged automatically by jenkins after successful build test
Add a cookbook to set tcp keepalived timeouts

This will be consumed by any cookbook that needs to communicate with
mysql or rabbitmq

Partially fixes https://github.com/rcbops/chef-cookbooks/issues/562
Merge pull request #132 from rackerjoe/master

Merged automatically by jenkins after successful build test
Updating version # to 4.1.2