commit development & production copies of main stylesheet
update <footer> html  (see msg)

-add 'clearfix' to <footer> element and "copyright-style" & "colophon" ids
-remove dummy text from the "colophon" element
add "colophon-class" to the mobile first view
update elements in <footer> (see msg)

-give <footer> a fixed height via the "footer-class"
-change "copyright-class" name to "copyright-style"
-add properties to "colophon-class"