* Minor documentation updates
… (it used to be a constant) [FIX] -itemSize should use the ratio of _itemSize's dimensions (it was using a hardcoded ratio)
…holder imageRef] in a loop causes serious speed hits when adding to the content array.
…erFlowView.m, invoked from an NSInvocationOperation.
…do not have an image assigned or have not yet had their image loaded.
Slight modifications to docs for other classes.
…ing of images
…ise, CoreGraphics freaks out when trying to create graphics contexts.
Basic code (and especially math) based on CovertFlow example.