Include QuartzCore in OS X's SVGKit prefix header.
Revert the change of making NSStringFromLibxmlString a macro.
Make NSStringFromLibxmlString a static inline.
Go back to using a macro, this time accounting for null strings passed to it.
If you wish to use the function, just set the preprocessor macro USENSSTRINGFROMLIBXMLSTRINGFUNCTION to 1.
Merge branch 'master' into arc