ZeroTB cobrand

Cobrand for ZeroTB reporting cobrand.

Main changes are:
* Cobrand files for ZeroTB
* Cobrand option allowing comment to be confirmed with no email confirmation
* Cobrand option to include comment time in alerts
* Logo split out to own template to allow easier overriding by cobrands
* RSS link tags split out to own template
* Facebook open graph tags split out to own template
* location errors now have an additional flag to indicate the type to make it easier to override the message in templates