[chef] Test AMIs

[Jake Vanderdray < >]

   Are there standard AMIs that folks use to test cookbook changes
before submitting pull requests back to opscode?  I've found AMIs to
use, but it would save me some time if there was a list of AMIs to use
to test against.  So before I submit a change back I could try
spinning up a CentOS 5.x instance, a CentOS 6.x instance, etc.

Thanks,
Jake.