* first successful rendering with cuda (https://dl.dropboxusercontent.com/u/1004620/Screen%20Shot%202013-06-18%20at%2001.34.07.png), still very wip
 * added opencl/cuda dump_buffer function (completely dumps a buffer object to a file; used for debugging purposes only)
 * fixed cuda vector access replacement (off by one ...)
 * gather, store and print more cuda device specific info (local+private mem size, work-item sizes, printf buffer size)
 * define LOCAL_MEM_SIZE for cuda kernels (set to 48KiB for now, as this applies for all supported cuda devices)
 * ifdef'ed explicit cuda compiler specification (only use llvm-g++ on os x)
 * enabled "OCLRASTER_INTERNAL_PROGRAM_DEBUG" for now (uses kernels from data/kernels/ instead of internal ones)
 * fixed comment typo in oclr_cudacl.h
 * version bump to 0.0.4-d1