Added new method getLogger(). It can generate meaningful logger name depending on context. This method should be extended in the future.

Modified DebMes. No sense to use __METHOD__ for looger name. __METHOD__ always returns "DebMes", it doesn't return original caller method name.
Configured logger "class.object". We don't need a filename if we got error inside evaluate.
Use new getLogger() for evaluate (only for objects.class.php and scripts.class.php now). It generates meaningful logger name and also it writes object name + method name. Much better to debug issues in custom code.
Added documentation for getLogger() method.
Merge pull request #35 from dimitrystd/Improve_logger_name

Created new alternative for DebMes method