Ajm march2014

Made the agreed changes:

Add Testimonial Group to the All Testimonials List http://wordpress.org/support/topic/how-to-customize-title#post-4970364
Resolve Linking requiring pretty permalinks https://github.com/ivycat/IvyCat-Ajax-Testimonials/issues/11
Make the text for the link to all testimonials in the widget editable
Change to not be a static class