pull filter gradients out completely because IE can't render them correctly in half of all instances and they are performance problems with them; tweak alert message styles, particularly close button;

updated docs to fix inconsistent display of code elements, update scaffolding to fix padding issue on fluid containers, add placeholder hero unit in patterns for future use, continue to refactor some rgba to hex values

adding more details on browser support, adding snippet of about text, changed p tags to have half the bottom margin