Change documentation (issue #7)
This version introduces multiple enhancements:

Modified part for core libraries.
All documentation changed to english language, and written missing documentation.
Also changed some code convention in the same files.

Details of additions/deletions below:
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Modified:   /BLUE_FRAMEWORK/packages/valid/valid_class.php
            -- Modified --
               changed code conventions
               added documentation

Modified:   /BLUE_FRAMEWORK/packages/valid/simpleValid_class.php
            -- Modified --
               changed code conventions
               added documentation
                changed some method names

Modified:   /BLUE_FRAMEWORK/packages/user/clientData_class.php
            -- Modified --
               changed code conventions
               added documentation

Modified:   /BLUE_FRAMEWORK/packages/user/log_class.php
            -- Modified --
               changed code conventions
               added documentation
               changed some method names