metatag 7.x-1.0-alpha3

Changes since 7.x-1.0-alpha2:

• Fix entity objects may have been altered by other modules like CTools/Panels, so always reload the entity from cache.
• Clear caches when config is saved.
• Fixed PHP notice if the language context in metatag_field_attach_view_alter() is NULL.
• Fixed meta tags should use unsanitized token replacement since the meta tag theme functions run check_plain() with drupal_attributes().
• #1284056: Fixed workaround for core issue #1284642 due to form submit handlers cannot be added in hook_field_attach_form().
• Skip adding fieldset summary JavaScript if form does not have vertical tabs.