Binds a handler to an event (in the same way as in the jQuery implementation).
Returns the 'this' object.
The required eventType is a string that identifies the event to bind to. The possible values for the 'eventType' parameter are described in the USoft Events section.
The optional data is a key-value map that contains certain data options to be passed to the event as its events.data object.
The optional handler(event) is a function that identifies the entry to be removed.