Multiple minimizations/deletions

removed non-grayscale colors. in turn, links, alert colors and
non-grayscale background/color classes are removed.
removed helper classes like well, alert, sticky and hollow
removed progress bar styles
fixed A.button visited color
made A fill width of LI in NAV
Moved a lot to sandbox for both rethinking, editing, and possible
removal
Merge branch 'minimization'