By DamienMcKenna: Whitespace adjustments to metatag.metatag.inc.
Issue #2362639 by DamienMcKenna: Improved defaults for Google+ meta tags.
Issue #2318985 by DamienMcKenna: Indicate that Open Graph tags are used on Pinterest.
Issue #2362639 by DamienMcKenna: Added itemtype default values for Google+ meta tags.