- renamed Call-to-Action variables and shortcode attributes

git-svn-id: https://plugins.svn.wordpress.org/rdp-wiki-press-embed/trunk@1043030 b8457f37-d9ea-0310-8a92-e5e31aec5664
- update screenshot #5

git-svn-id: https://plugins.svn.wordpress.org/rdp-wiki-press-embed/trunk@1043041 b8457f37-d9ea-0310-8a92-e5e31aec5664