Revert "Use the UIView drawViewHierarchyInRect method instead of the layer's renderInContext method to avoid a bug found while using FXBlurView in iOS 8: https://github.com/nicklockwood/FXBlurView/issues/79  Note this change works well for iOS 7 and later, but most likely won't be pulled in to the master FXBlurView branch because it doesn't work as well on versions earlier than iOS 7."

This reverts commit e1ee80a1b1b826ae2a062e2c66cf15a5de486c74.
Merge branch 'master' of https://github.com/Clinkle/FXBlurView into clinkle_podspec