Fixes Featured Image Error.  Adds ability to control, via widget and shortcode, the number of testimonials that are displayed.  Adds option to set Custom CSS via the Settings panel.  Updates readme and screenshots to match new features and fixes.

git-svn-id: https://plugins.svn.wordpress.org/easy-testimonials/trunk@769804 b8457f37-d9ea-0310-8a92-e5e31aec5664