Item12626: added 7 more providers

   * Alpha App
   * Github Gist
   * GMEP
   * Shoudio
   * WordPress TV
   * YFrog



git-svn-id: http://svn.foswiki.org/trunk/OEmbedPlugin@17035 0b4bb1d4-4e5a-0410-9cc4-b2b747904278