change Ldpath.R to parse lib path of other package (e.g. rhdf5). #11
finish hdf5 version of _createFile routine. #11
add hdf5 version of _readSlice and _writeSlice routine. #11
add chunking. #11
add wrappers.c #11
store event counts as 1d dataset instead of attribute to avoid dynamically allocating array for it. #11
add error handling. #11
pass the test of vignette. #11
add wrappers.h