bug fixes: USD money format was showing even when left empty, CSS for backend is better mobile resonsive. New: shortcode to insert Specs anywhere on post or page. Tested for WP 3.8 compatibility.

git-svn-id: https://plugins.svn.wordpress.org/easy-digital-downloads-software-specs/trunk@821633 b8457f37-d9ea-0310-8a92-e5e31aec5664