* Changed the logic for HEAD requests for HTTP authentication. Default WordPress behavior is to exit all HEAD requests.

* Changed all content types to either use the site default or use UTF8 (applies to play in new window and 401 Unauthorized HTML pages).

git-svn-id: https://plugins.svn.wordpress.org/powerpress/trunk@977458 b8457f37-d9ea-0310-8a92-e5e31aec5664