Fix for regression from previous pull-request merge. Title mode should now function again, and no longer issue a PHP notice error when attempting to set it to a non-default value.
Merge remote-tracking branch 'origin/master' into fix-title-append

* origin/master:
  fix
  added more tags                 'og:image',                 'article:author',                 'article:publisher',                 'og:type',                 'og:site_name',                 'og:locale',                 'article:tag',                 'article:section',                 'fb:admins',                 'fb:app_id',                 'twitter:card',                 'twitter:site',                 'twitter:domain',                 'twitter:creator',                 'twitter:image:src',                 'twitter:description'     removed leading spaces     removed extra new line at the end     @fortasse helped a lot with these changes
Merged property check from new tag types.
Fixed title_mode parsing and added new property title_separator to define a separator when using append or prepend modes.
Merge pull request #8 from andru/fix-title-append

Fix title append