removeViewWhenHidden property added

[kawanet]

removeViewWhenHidden property added to call removeFromSuperview after hudDidDisappear fired.

Usage:

[hud setRemoveViewWhenHidden:YES];

This works as similar to following:

• (void) hudDidDisappear:(ATMHud*)hud
  {
  [hud.view removeFromSuperview];
  hud.view = nil;
  }

I'm using ATMHud just for show alert message.
This property=YES helps me to avoid using delegate.
Calling hudDidDisappear would make crashed when an object is not exist.

Thank you for providing this great library anyway.

[dhoerl]

I added this to my fork, dhoerl/ATMHud, which I plan to support for a long time.