Added in option for upcoming 'validate_on' option for abide. This can vary...

Added in option for upcoming 'validate_on' option for abide. This can vary between values 'tab', 'change', and 'manual.' If the user selects 'manual,' individual elements can be validated by triggering the event 'validate.fndtn.abide' and the entire form can be validated by triggering 'submit.fndtn.abide.'