Core update

This version introduces multiple enhancements:

added math library for Core_Blue, enabled some new modules

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

Added:      /Lib/Core/Blue/Helper/Math.php
            -- Added --
                some mathematic methods

Modified:   /Lib/config.ini
            -- Added --
                enabled core_time and core_image modules
            -- Updated --
                changed version from 0.16.0 to 0.17.0

Modified:   /Lib/Core/Blue/etc/config.ini
            -- Modified --
                changed version from 0.6.2 to 0.7.0