PSize: Use initializer_list
Merge branch 'init_list'
Makefile[darwin]: Switch to libc++ for clang target

You need to have the dependencies compiled with libc++ as well
for this to work
XCode: project file update
Makefile[darwin]: switch back to clang as default
gitignore: ignore sublime specific files
DataSet: add guessChunking(PSize, size_t elementSize)