Group::hasObject(): use H5Lexists()
PSize: explicitly include <algorithm> for std::for_each
Makefile.darwin: add support for gcc
Selection: Fix cast to target size_t not hsize_t
Charon: Rename a few variables to not shadow functions
Merge pull request #10 from gicmo/group_hasobj

Group::hasObject(): use H5Lexists()
Makefile[darwin]: default to gcc for now
XCode: update project file