This adds a title field to the widget, and wraps it in standard Wordpres...

There are a number of additions here. I wrote these up yesterday for a client project. 

1. Give the widget a title field, and wrap it inside the widget wrapper. For solid theme compatibility, this is critical. 
2. Allow themes/plugins to render testimonials in their own way. Note the `ct_pre_render_testimonial` and `ct_render_testimonial` filter hooks in `class.wp-testimonial.php`. 
3. Take a `$context` parameter in the `render()` method for testimonials so that themes/plugins using the above filters can style them in a different way. 
4. Passed `context` and `word_limit` as additional arguments to the ajax rotator script. 
5. Got rid of `array_pop` in the `ajax_get_random_testimonial()` function; that was breaking the Ajax response for me. 

Cheers, 
Eric