acquia_prosper 6.x-1.0

#594022 by eternalistic: Special attention to checkout buttons
#855708 by eternalistic: Ubercart invoice template styling
#872510 by eternalistic: Fixed product images from overflowing the content area
#836232 by eternalistic, rodrigoaguilera: Changed the background declaration on table cells from "background" to "background-color" to better work with the Advanced Forum module.
#827698 by eternalistic, Georgii: Fixed the z-index and overlapping issue with the sidebar primary menu block with Superfish dropdown styles applied.
#804756 by eternalistic: Product attributes were always right aligned even when product details were disabled. Added an if statement to resize the columns based on the content that appear within them.
#649184 by eternalistic: RTL support has been improved for Acquia Prosper and images and styling are in place and ready for further testing.
Added "border-radius" along with "-moz-border-radius" and "-webkit-border-radius" to work with more browsers.