several tweaks. Upgrading plugin version

git-svn-id: https://plugins.svn.wordpress.org/bepro-listings/trunk@1015254 b8457f37-d9ea-0310-8a92-e5e31aec5664
added security tweak. Upgrading plugin version

git-svn-id: https://plugins.svn.wordpress.org/bepro-listings/trunk@1015280 b8457f37-d9ea-0310-8a92-e5e31aec5664
tweak documentation

git-svn-id: https://plugins.svn.wordpress.org/bepro-listings/trunk@1015284 b8457f37-d9ea-0310-8a92-e5e31aec5664