updating readme and minor fix to get all widgets when no widgets

git-svn-id: https://plugins.svn.wordpress.org/widget-wrangler/trunk@860333 b8457f37-d9ea-0310-8a92-e5e31aec5664
readme formatting

git-svn-id: https://plugins.svn.wordpress.org/widget-wrangler/trunk@860337 b8457f37-d9ea-0310-8a92-e5e31aec5664