re #58 - added opengraph info
re #60 - individual blog pages now also have the blog menu item highlighted. This has been done by adding a layout seeting to blog in config.yml and compare the link.layout with the page.layout in the menu
re #60 - changed script defining active items. Now same as in nooku
re #58 - renamed rss_url to site_url and changed static timble urls to site.site_url
re #58 - changed back to site.url
Merge branch 'feature/58-opengraph'