added implementation of atomic exchange for OS X using __sync_lock_test_and_set
aligned malloc implementation for OSX
Fixed conformance issues in SList, STailList and List picked up by LLVM. Mostly removing incorrect typename usage (removed some, added some), pass iterators by value like STL does e.g. to insert_after(),  fixed some mis-declared parameter names
XCode 4.6 project file
ignore XCode workspace files