(Bug 5241) Fix whitespace and long lines; update revision date.

- Rewrap excessively long lines

- Remove trailing whitespace

- Update "last revised" date to today
(Bug 5241) Reword TOS to omit mention of invite codes.

Invite codes are no longer required - update the terms to reflect reality.
Merge pull request #555 from kareila/bug5241-tos

(Bug 5241) Reword TOS for optional invite codes.