deletes assets directory in trunk

git-svn-id: https://plugins.svn.wordpress.org/ah-o2/trunk@847272 b8457f37-d9ea-0310-8a92-e5e31aec5664
updates readme & moves assets to trunk

screenshots available on github project page

git-svn-id: https://plugins.svn.wordpress.org/ah-o2/trunk@847273 b8457f37-d9ea-0310-8a92-e5e31aec5664