BlogCustomLayoutPrepare.swift

override func prepare(){
	//Here we calculate all the dimensions we need for our collection view
	//Stuff like item height, item width and collection view size
	//We create x and y offsets for our items based on their collection position
	//Also we create layout attributes for each item inside our collection view
	//Layout attributes are cached so we wouldn’t need to recalculate them 
	//every time attribute is requested
}