fixed tracer serialization [0.4.1]

This version introduces multiple enhancements:

fixed error when object throw exception after serialization

Details of additions/deletions below:
--------------------------------------------------------------

Modified:   /Lib/Core/Benchmark/Helper/Tracer.php
            -- Added --
                usage of Exception
            -- Updated --
                marker, added try/catch to serialize object

Modified:   /Lib/Core/Benchmark/etc/config.ini
            -- Modified --
                changed version from 0.4.0 to 0.4.1