Changed default styles. Generally removed styles and modified spacing.
Removed all styles from overall wrapper; this should allow more default mail client styles
to be applied, for more consistent looking email. Increased the space between paragraphs a
little, to better match Gmail+Chrome's default (double newline) look. Reduced vertical
spacing within lists (and especially for sub-lists, which were just wrong). Removed all link
styling, so the default will be used. Removed some header and definition list styling that
wasn't doing anything anyway. Removed an unused class. Added a background color to table
headers.