Adds kitchen tests to the cookbook.

This is branched off the `service-init` branch.
Updates README.md with information to run tests

This includes unit tests as well as integration tests.
Add support for centos 6.x
No longer used hard coded statsd user
Merge pull request #25 from cotap/kitchen-ci

Kitchen ci
Merge branch 'master' into support-centos-6
Add centos-6.5 to test configuration
In serverspec, force Debian instead of DetectOS to properly detect statsd service for upstart on CentOS 6.
Merge pull request #28 from david-richer-adsk/support-centos-6

Add support for centos 6.x
Update metadata.rb