Explicitly select environment, ensure missing kernel module is loaded.

Warn against use of VirusTotal for private files.

Run OnionShare before the common role if it is requested on a host.

Add OnionShare receiver as a deployable option to Library branches.

Fix Travis CI build; don't do disk quotas in this case.

Update README with better install instructions.

Use `.yaml` instead of `.yml` as YAML file extension where possible.

Remove custom Onion service configuration code.

Add a simple Library scanner utility script.

Add some information on OPDS clients.

Style Library list links as buttons, ensure proper file permissions.

Spruce up the default landing page.

Tweak synchronization task, include Calibre role variables in example.

Use upstream feature for opening firewall ports.

Add convenience mechanism for opening additional ports in the firewall.