WIP: Finish and release v2.0.0

[hartmantis]

What work remains to cut a v2 release?

• [ ] What permissions should be used for the config files? At least in Ubuntu, the default clamd.conf and freshclam.conf have different ownership and different permissions.
• [ ] Finish refactoring the initial update strategy. When should freshclam by run via an execute? When should Chef wait for it before proceeding?
• [ ] Finish refactoring the old cron recipe into a scheduled scan custom resource.
• [ ] Finish the clamav_addon resource, or make it just for clamav-milter and clamsmtpd if that's easier, (this could also wait for v2.1).
• [ ] Finish re-adding Debian support and testing.
• [ ] Finish adding back RHEL support. Note that RHEL7 has separate packages for systemd vs sysvinit support.
• [ ] Add any other supported platform support and testing (Fedora?).
• [ ] Update the README.
• [ ] Fix the inevitable remaining build failures.

[coveralls]

Changes Unknown when pulling 6c1e4ecb0219be7ceb49af00ad63c640789e088a on jdh-v2.0 into on master.