Change default framework view (issue #17)

This version introduces multiple enhancements:

some samll style changes

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

Added:      /BLUE_FRAMEWORK/elements/css/base.css
            -- Added --
                base style for all pages

Modified:   /BLUE_FRAMEWORK/cfg/tree.xml
            -- Added --
                base style for all pages

Modified:   /BLUE_FRAMEWORK/elements/css/css3.css
            -- Updated --
                removed some rules, changed code convention