CMOCK_MEM_ALIGN should not change depending on #include order.

The value of CMOCK_MEM_ALIGN changed depending on whether unity.h
or cmock.h was included first.  Since cmock_internals.h uses
features from unity.h, it should include unity.h.

src/cmock.c

@@ -4,7 +4,6 @@
     [Released under MIT License. Please refer to license.txt for details]
 ========================================== */
 
-#include "unity.h"
 #include "cmock.h"
 
 //public constants to be used by mocks

src/cmock_internals.h

@@ -7,6 +7,8 @@
 #ifndef CMOCK_FRAMEWORK_INTERNALS_H
 #define CMOCK_FRAMEWORK_INTERNALS_H
 
+#include "unity.h"
+
 //These are constants that the generated mocks have access to
 extern const char* CMockStringOutOfMemory;
 extern const char* CMockStringCalledMore;