added method to get both unblurred and blurred snapshots in an array

@smbarne I was wanting to get both a snapshot and blurred snapshot of a view without having to get a context or call drawViewHierarchyInRect twice in a row. In my case, this involves wanting to create a blur fade-in effect for a mapview where I can also hide the mapview once it has been snapshotted. 
“iOS 7” has a space in it. Are you referencing the Apple sample code from WWDC 2013? Might want to be specific about which supplied blur image method you’re talking about.