Leaderboard based task application.
Add local storage polling to synchronize tabs.
Task improvements.

- Add quarterly frequency.
- Sort same due date tasks by score descending.
Add ability to split task scores between users.
Start to specify task approvals.
Add data backup folder.
Normalize last completion times

They are now available at midnight of the day on which they become
available.
Add today and 7 day totals to user table.
Fix some bugs.

- Fix data bug.
- Fix bug with user score filter.
Use computed total score for users.
Trying to find total display bug.
Fix bug relating to weekly tasks.

- Weekly tasks were not available to complete on the first day they
  should have been.
Add a simple filter control.
Color task rows by score.
Add task filter by last completion time.
Change last completion filter labels.
Add task available filter.
Add a README