updated readme and plugin meta

git-svn-id: https://plugins.svn.wordpress.org/photopress-sideways-gallery/trunk@863812 b8457f37-d9ea-0310-8a92-e5e31aec5664
fixing height issue under safari.



git-svn-id: https://plugins.svn.wordpress.org/photopress-sideways-gallery/trunk@867712 b8457f37-d9ea-0310-8a92-e5e31aec5664