Non-critical updates: 
Fixed incorrect reference in help/tips of recommended Facebook image sizes. 
Added help topic and suggested fix for those experiencing rare issue of image dimensions not showing in plug-in. 

git-svn-id: https://plugins.svn.wordpress.org/facebook-thumb-fixer/trunk@1017048 b8457f37-d9ea-0310-8a92-e5e31aec5664