* Adding comprehensive HTML output filtering with dg_gallery_template, dg_row_template, and dg_icon_template.
* Fixed minor bug in time output (handling timezones) and centralized this logic in DocumentGallery class

git-svn-id: https://plugins.svn.wordpress.org/document-gallery/trunk@998215 b8457f37-d9ea-0310-8a92-e5e31aec5664