Add option to use the cron_d LWRP.
Merge pull request #56 from gmcmillan/crond-option

[COOK-2192] Add option to use the cron_d resource.
[COOK-2192] - need to depend on cron for lwrp
[COOK-2261] - add version for runit

* Suggests in metadata isn't implemented, but used for documentation,
so add version
release v2.1.8
update test-kitchen dep
Merge branch 'master' of git://github.com/opscode-cookbooks/chef-client

* 'master' of git://github.com/opscode-cookbooks/chef-client:
  update test-kitchen dep
  release v2.1.8
  [COOK-2261] - add version for runit
  [COOK-2192] - need to depend on cron for lwrp
  Add option to use the cron_d LWRP.