Setup instructions should mention QuartzCore framework dependency

[chrisvasselli]

I had some trouble setting this up. I was getting a linker error:

Undefined symbols for architecture i386:
"OBJC_CLASS$_CALayer", referenced from:
objc-class-ref in libiOSHierarchyViewer_fat.a(HVHierarchyScanner.o)

It turns out that the problem was that I wasn't linking against the QuartzCore framework. I didn't see any mention that this was a dependency in the instructions. Seems like it probably should be.

By the way, now that it's working, this is a very very awesome tool.

[damian-kolakowski]

thanks !