Left aligned class names and added column colouring

The class headings are now left aligned instead of center aligned and
every other class column is now highlighted in a light grey colour.
Although in Adobe Reader the lines between the cells display poorly,
when printed everything comes out just fine.
Moved sign-in up the page 0.1in

The top margin of the sign-in has been decreased by 0.1in.  This helps
center the form on the page.