Fix #23 - Restores label basic functionality

[ramaroberto]

I tried to satisfy the requirement described in the issue #23. Maybe it's not the best solution or has a bug I didn't ran into, but at least it's working for me.

It's highly recommended to check the solution.

Robert.

[aAXEe]

Your solution fixes the problem that clicking on the labels do not change the value for me.
But it "disables" the click function on the toggle itself. In detail: the toggle() function seems to be called twice in that cases: once from your handler in line 35 and once from the old handler in line 186.

From my tests the old handler can be removed.
Update: should be moved in the else branch of if (this.$element.parent().prop('tagName') == 'LABEL') {