initial commit of version 0.9.6 from phash.org
first commit
Update README.markdown

Signed-off-by: Yi-Feng Tzeng <yftzeng@gmail.com>
Fixed compatibility with pHash ruby gem (https://github.com/toy/pHash).

see http://stackoverflow.com/questions/23414036/segmentation-fault-error-when-trying-to-compare-two-videos-with-phash-library-an
extern "C" for all functions in audiophash.h