Ensure closing of prompt; new validation rule for dates in d/m/y format.

[cngarrison]

I found a couple of instances where prompts were not closing properly. First is for 'prettySelect' fields using a prefix or suffix; the class name used for the selector was wrong. The prefix/suffix need to be included in the class name.

There was a similar issue with prompts attached with 'jqv-prompt-at' not closing.

Change to the jquery.validationEngine-en.js file is a new validation rule for dates in the dd/mm/yyyy format.