Mavericks compatibility (doco, Cmake, etc.)

I've tweaked the Cmake configuration to permit out-of-the-box building on Mac OS X 10.9 "Mavericks", and I've updated the Readme with cookbook-style instructions on getting the code to compile in 10.9. 

I hope this helps the multitude of folks I've seen struggling with opaque CUDA "dumpspecs" errors and the like.