fix issue #7 - keyboard show / hide support
update README
added use of quartzcore framework in order to improve performance
fix import
Update README.md
fix issue #15
update fix issue #15
fix issue #16 - iOS 5 support
fix issue #16 - iOS 5 support
Merge branch 'master' of https://github.com/nicolaschengdev/WYPopoverController

Conflicts:
	WYPopoverController/WYPopoverController.m
update README
update README
update screenshots
update screenshots
update screenshots