Revert "PR: Support modally presented controllers"
Revert "PR: Support modally presented controllers"

sammcewan/WYPopoverController,vitalys/WYPopoverController,thelearningclinic/WYPopoverController,jiamaozheng/WYPopoverController,Mindera/WYPopoverController,pinkowitz/WYPopoverController,Voxer/WYPopoverController