[O] Add publishing with utf8

[sindikat]

I use standard org-mode methods to publish my projects to html. However by 
default they are published with tag <meta http-equiv="Content-Type" 
content="text/html;charset=iso-8859-1"/>, however i need charset to be 
changed to "utf8", as i am using Russian in my blog too. Please make it 
possible somehow. Best wishes.