Merge pull request #297 from Tuc-an/size_t

change CMOCK_MEM_INDEX_TYPE default type to size_t

docs/CMock_Summary.md

@@ -732,7 +732,7 @@ based on other settings, particularly Unity's settings.
 
 * `CMOCK_MEM_INDEX_TYPE`
   This needs to be something big enough to point anywhere in Cmock's
-  memory space... usually it's an unsigned int.
+  memory space... usually it's a size_t.
 
 Other Tips
 ==========

src/cmock.h

@@ -16,7 +16,8 @@
 
 /* should be big enough to index full range of CMOCK_MEM_MAX */
 #ifndef CMOCK_MEM_INDEX_TYPE
-#define CMOCK_MEM_INDEX_TYPE  unsigned int
+#include <stddef.h>
+#define CMOCK_MEM_INDEX_TYPE  size_t
 #endif
 
 #define CMOCK_GUTS_NONE   (0)