Add mabs_blog_name, mabs_blog_pages filters

git-svn-id: https://plugins.svn.wordpress.org/multisite-admin-bar-switcher/trunk@1007554 b8457f37-d9ea-0310-8a92-e5e31aec5664
Update readme

git-svn-id: https://plugins.svn.wordpress.org/multisite-admin-bar-switcher/trunk@1007556 b8457f37-d9ea-0310-8a92-e5e31aec5664