Serials: improve routing slips per Dan Wells' suggestions on LP #1229349

  - Don't repeat the same address for the same user
  - Label mailing vs. billing
  - Border to separate mailing and billing addresses
  - [Also] move some inline styles to a CSS file

Signed-off-by: Lebbeous Fogle-Weekley <lebbeous@esilibrary.com>
Signed-off-by: Remington Steed <rjs7@calvin.edu>