Adds new option - Testimonials Style.  Allows user to select from a list of pre-styled layouts.
Updates the screenshot of the settings screen to display the new option.
Adds newly required css files for the new themes.

git-svn-id: https://plugins.svn.wordpress.org/easy-testimonials/trunk@753128 b8457f37-d9ea-0310-8a92-e5e31aec5664