Added Option to add class to displaytext block
This Feature adds a Class-Option to the Displaytext Block and adds a wrapping div with that class if set.
Benefit If you want to add a special styled text to your form, it comes in handy to add a wrapping div with a class without adding markup clutter to the textfield. E.g. for a notification box as usually provided by your css framework (.alert-success with bootstrap or .uk-alert-primary with UiKit)