Make SVGKImage build under OS X.
Add a new function to SVGKImage to get an NSImage.
On 64-bit OS X, we can pass CGRects to functions that ask for NSRects. The same is true of NSPoints and CGPoints
Merge branch 'master' into arc

Conflicts:
	Source/SVGKImage.h
	Source/SVGKImage.m
Make the code be ARC-compatible again.