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My girlfriend was not happy about the iOS 8 update did break the app, because all her students uses it in all her classes :-)
So here you have a pull request. The most important change was in Brushes-Info.plist where public.data is changed to public.folder to make the app able to save/read data (iOS 8 does not understand public.data for a bundled folder). I also checked Full Screen at Launch in Interface Builder for the MainWindow.xib to make the view work in iOS 8. For some reason it was necessary to import OpenGLES/ES2/gl.h in WDUtilities.h to make it build.
There seems to be a lot of number conversion precision issues when building for 64 bit, but I did just set the compiler to ignore it.
I've tested on an iPad 1 (5.1.1), iPad Air (8.0) and the iOS 7.1 simulator.