Add tap gesture to close view.

OK. 

I got it.

> ÔÚ 2014Äê8ÔÂ14ÈÕ£¬22:08£¬Heberti Almeida <notifications@github.com> Ð´µÀ£º
> 
> In HATransparentView/HATransparentView.h:
> 
> >  @optional
> > -- (void)HATransparentViewDidClosed;
> I don't think we need change this, because everyone will be affected.
> 
> ¡ª
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