Add cover/ to .gitignore to ignore nose --cover-html output
Add HostNameCheck for ipv4, ipv6, and DnsName/HostName validation
Add UrlCheck and EmailCheck
Fix tiny Bug in VCardLine.set_attr to update existing attrs
Add tests for config, eventlog, and vcard

Remove relic

Allow empty slugs
Fix bugs in new tests
Update tags spec to not allow only URLs for icons
Fix help, fix old test script, tests pass again