Added site filter, WP4.0 compatability

git-svn-id: https://plugins.svn.wordpress.org/multisite-admin-bar-switcher/trunk@1002962 b8457f37-d9ea-0310-8a92-e5e31aec5664
Added missing files

git-svn-id: https://plugins.svn.wordpress.org/multisite-admin-bar-switcher/trunk@1002965 b8457f37-d9ea-0310-8a92-e5e31aec5664
Version bump

git-svn-id: https://plugins.svn.wordpress.org/multisite-admin-bar-switcher/trunk@1002968 b8457f37-d9ea-0310-8a92-e5e31aec5664