Make full example modules (issue #20)

This version introduces multiple enhancements:

finished example with core markers
fixed documentation

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

Added:      /BLUE_FRAMEWORK/modules/example_core_markers/elements/js/show.js
            -- Added --
                script to get all link, script and meta nodes to show them in example page

Modified:   /BLUE_FRAMEWORK/modules/example_core_markers/layouts/index.html
            -- Updated --
                structure to handle properly some markers content

Modified:   /BLUE_FRAMEWORK/modules/example_core_markers/lang/example_core_markers_pl-PL.php
            -- Added --
                polish translations

Modified:   /BLUE_FRAMEWORK/modules/example_core_markers/lang/example_core_markers_en-GB.php
            -- Added --
                english translations

Modified:   /BLUE_FRAMEWORK/modules/example_core_markers/example_core_markers.php
            -- Updated --
                _prepareLayout, added javascript to page

Modified:   /docs/template.md
            -- Updated --
                fixed some core markers description