Merge pull request #339 from AndrejMitrovic/FixDBC

Make note that asserts are gone in release mode except the special assert(0)

dbc.dd

@@ -45,6 +45,11 @@ assert(expression);
 	when the code must deal with errant uses by other code, when it must be
 	failure proof, and as a useful tool for debugging.
 
+    $(P When compiling for release, the assert code is not generated.
+        The special $(D assert(0)) expression, however, is generated even in
+        release mode. See the $(GLINK2 expression, AssertExpression) documentation
+        for more information.)
+
 $(H2 Pre and Post Contracts)
 
 	The pre contracts specify the preconditions before a statement is executed. The most