c++03 -> c++11 switch:

- use std versions of function, bind and ref
- OVERRIDE -> override
- NULL -> nullptr
- use std versions of random distributions

NOTE: this may be last revision that supports gcc-4.5

lib/UnlockGuard.h

@@ -62,18 +62,18 @@ namespace vstd
 
 		unlock_guard()
 		{
-			m = NULL;
+			m = nullptr;
 		}
 
 		unlock_guard(unlock_guard &&other)
 			: m(other.m)
 		{
-			other.m = NULL;
+			other.m = nullptr;
 		}
 
 		void release()
 		{
-			m = NULL;
+			m = nullptr;
 		}
 
 		~unlock_guard()