Added a reference to _blurLayer which is the copy of UIToolbars layer. The layer now stretches to get the same size as its superview. I didn't want to find the superview , loop through its layers and update them, since we can add more subviews to this and so on. This is probably the worlds longest commit message.
Update AMBlurView.m

Added property to the blur layer
Merge pull request #2 from simonwesterlund/master

The blur is now resized correctly when frame is resized.