Added tags as per #665.
Renumber tag order values on tag add/delete
Add cover/ to .gitignore to not track nose --cover-html output
Add ipv4 and ipv6 checking to config._HostNameCheck
Add config._EmailCheck and config._UrlCheck
Fix small Bug in VCardLine.set_attr for updating existing attrs
Add tests for config, eventlog, and vcard
Rename _UrlCheck to _HttpUrlCheck to be more explicit

Be more thourough in HostName checking without DNS

Add even more tests for new split in HostNameValid and HostNameCheck
Start working on a way to add other uri schemes to validation