Change default framework view (issue #17)

This version introduces multiple enhancements:

added bootstrap script to show dropdown menu after button hover

Details of additions/deletions below:
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Added:      /BLUE_FRAMEWORK/elements/js/bootstrap_dropdown_hover.js
            -- Added --
                Bootstrap Hover Dropdown library

Modified:   /BLUE_FRAMEWORK/cfg/tree.xml
            -- Added --
                loading js library for all pages