Changed "const X ref"s to "X const ref"s

- Brought older code up to current convention (with the help of a Python script)

include/internal/catch_option.hpp

@@ -41,7 +41,7 @@ namespace Catch {
             nullableValue = NULL;
         }
         T& operator*() { return *nullableValue; }
-        const T& operator*() const { return *nullableValue; }
+        T const& operator*() const { return *nullableValue; }
         T* operator->() { return nullableValue; }
         const T* operator->() const { return nullableValue; }