Made li list style dots more specific

We set all li elements to use list-style disc, but it was affecting our
navbar.  Changed it to use a specific class in the crop hierarchy (where
we actually cared about it).
Fixed navbar display CSS

1) Made sure padding is applied to the body *only* for the larger screen
sizes (by doing so before the responsive CSS is loaded)

2) Fixed indentation on the footer, which was incorrectly putting it
inside the main body container, and thus making it do this weird
narrowing thing at smaller screen sizes.
Merge pull request #319 from Skud/css-fixes

Css fixes