Remove unused trailing tags in application layout.
Add footer, update header with spaghetti image.

Add the footer, update the header with the spaghetti image, update the
title in the application layout.  Change the blog.css stylesheet to
support floating the spaghetti image to the right above the About
section and Archive links.
Always show top nav.

Always show the top nav even if not signed in.  If not signed in, then
show an empty nav.  If signed in then show the nav populated with links.
Update pager to work with new Bootstrap 3 css.

Update the custom pagination in spaghetti_pagination to place previous /
next links into an unordered list with the class name pager.  Remove the
static pager placeholder from the application layout.
Move the logo in the title to the left.

This seems to fit into the layout more cleanly when the page gets
rendered.
Don't render special layout for unpublished posts.

Don't render a special layout when viewing the index of unpublished
posts.  Originally it seems this was done to make it easier for the
admin user to view a complete listing of unpublished posts, but I am not
sure this is necessary any longer.