filler content

Added some filler content, and set class for main body div:

large-7 small-11 small-offset-1 columns

means that on large displays, the main body should only take up 7 of 12 columns (3 columns free for a sidebar and padding), but on small displays it should take up 11 columns (thus pushing the sidebar down to the bottom). Also, the main body should have 1 columns worth of padding on the left-hand side ("offset"), in both large & small displays.