metatag 7.x-1.0-rc2

This is the final release candidate before the forthcoming 7.x-1.0 within the next week. Several important improvements are included, most notably:

• Open Graph meta tag support has been improved with several additional tags added.
• At the API level it is now possible to indicate that one meta tag depends upon another, which is used to auto-hide meta tags when they are appropriate for use. So far this is only used with some of the Open Graph and Twitter Cards tags, it will be improved upon later.
• Added a settings page that grants access to several previously hidden features in Metatag. Please remember that these were previously hidden for a reason, it's possible to seriously over-complicate a site by enabling some of them, but the few sites that actually need them it's now easier to manage the options.
• Thanks to rooby it's now possible to obtain the meta tags for a given entity via a single function call; see README.txt for details.
• Several additional refinements and bug fixes.
• Metatag now requires Drupal 7.28.

As always, Metatag would be nothing were it not for the active support from the community, so a sincere thank you to all who helped with this important milestone.

Full changelog since 7.x-1.0-rc1:

• #1904266 by mvwensen, DamienMcKenna: Added the dcterms.modified meta tag.
• #2202031 by DamienMcKenna: Don't double-encode output, handle   specially.
• #2026343 by DamienMcKenna, skruf, valkum, wxman: Added many more Open Graph meta tags.
• #2164919 by DamienMcKenna: Added an Advanced Settings page.
• #2241083 by DamienMcKenna: API structure for definiting field dependencies; currently limited to hiding/showing fields, can be expanded later with validation logic. Initial implementation for some Open Graph and Twitter Cards meta tags.
• #2307523 by leewillis77, DamienMcKenna: Additional arguments for two drupal_alter hooks.
• #2241083 by rooby: Refactored meta tag output generation using a new function, metatag_generate_entity_metatags(), allowing for the tags to be independently obtained for a given entity.
• #2262159 by DamienMcKenna: Bumped core requirement to 7.28, removed the [node:summary] fix that's no longer needed.
• #2306449 by DamienMcKenna: Not having the Transliteration or Imagecache Token modules installed no longer reports an error in hook_requirements().
• #1328562 by andremolnar, Greg Boggs, DamienMcKenna: Improved form descriptions.
• #1918706 by theunraveler, DamienMcKenna, Zekvyrin, JeroenT: [current-page:title] didn't work correctly on Panels pages.
• #2153977 by paolomainardi, DamienMcKenna: Fix for translations of base entity type configuration when there is no bundle configuration.