Make full example modules (issue #20)

This version introduces multiple enhancements:

Finished example with library usage

Details of additions/deletions below:
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Added:      /BLUE_FRAMEWORK/modules/example_libraries/lang/example_libraries_en-GB.php
            -- Added --
                english translations

Added:      /BLUE_FRAMEWORK/modules/example_libraries/lang/example_libraries_pl-PL.php
            -- Added --
                polish translations

Added:      /BLUE_FRAMEWORK/modules/example_libraries/layouts/index.html
            -- Added --
                examples template

Added:      /BLUE_FRAMEWORK/modules/example_libraries/example_libraries.php
            -- Added --
                main example file with libraries usage

Modified:   /BLUE_FRAMEWORK/cfg/lang/core_en-GB.php
            -- Added --
                added english example description

Modified:   /BLUE_FRAMEWORK/cfg/lang/core_pl-PL.php
            -- Updated --
                added polish example description

Modified:   /BLUE_FRAMEWORK/elements/layouts/examples/examples.html
            -- Added --
                added example description

Modified:   /BLUE_FRAMEWORK/cfg/tree.xml
            -- Added --
                image libraries package for example_libraries page