Add dealloc to AMPopTip.
Add dealloc to AMPopTip.

If you remove AMPopTips from the screen using any other method than the `removeGesture`, it was possible to crash your app by having the gesture recognizer call out to a deallocated target. This protects against that.
KBvsMJ/AMPopTip,andreamazz/AMPopTip,AlexanderMazaletskiy/AMPopTip,KBvsMJ/AMPopTip,AlexanderMazaletskiy/AMPopTip,ikesyo/AMPopTip,eeschimosu/AMPopTip,Pole-he/AMPopTip,eeschimosu/AMPopTip,andreamazz/AMPopTip,jonesgithub/AMPopTip,felipecarreramo/AMPopTip,felipecarreramo/AMPopTip,Pole-he/AMPopTip,jonesgithub/AMPopTip,ikesyo/AMPopTip