* Fixed a bug that an undefined constant warning occurred in WordPress v3.4.x or below.
* Added the ability to perform authentication without creating an application by the user.
* Tweaked the caching system for embedded media elements.
* Tweaked the default template styles for embedded images to keep the aspect ratio.

git-svn-id: https://plugins.svn.wordpress.org/fetch-tweets/trunk@779004 b8457f37-d9ea-0310-8a92-e5e31aec5664