Fixed commit "replaced <cstring> with the C <stddef.h>".
The commit c94e6cfa86d621b503583369031c76798f270c04 removed the <cstring> include but didn't replace it with <stddef.h> and as a result the compiler throws an error for the iOS project as it can't find the definition of size_t.
Merge pull request #14 from colinmccune/master

Fixed "replaced <cstring> with the C <stddef.h>" commit.