acquia_prosper 6.x-1.0-beta4

#618544 by eternalistic, sociotech: fixed checkout page issues in IE
by eternalistic, sociotech: added Design Packs directory with all color definitions moved into Gray and Blue examples to demonstrate easier color changing
by stephthegeek: removed Prosper-specific list margins (now handled better in Fusion Core)
by stephthegeek: added border to table headers
by stephthegeek: added top padding on icon in shoppingcart-light style
by stephthegeek: added default link colour to shoppingcart-dark style
by stephthegeek: fixed: fusion-inline-menu style is doubling borders
by stephthegeek: changed default fluid width to 95%