Add test-kitchen support, closes #9

Test on:

* Ubuntu 14.04
* CentOS 6.5
* Debian 7.6

Don't test on:

* ArchLinux - rolling release, doesn't have a "bento" published basebox for vagrant, this platform is supported as a "best effort"
* Other ELs - CentOS should be "Good Enough" for other ELs, and I'm not planning to add Amazon support directly, since it requires using EC2

Fixes to get convergence:

* Change package name for CentOS to `samba`
* Set service provider if Ubuntu and > 14.04 due to upstream upstart-related bug
Merge branch 'test-kitchen'