cache the number of patrons in the participants table
remove `Participant.get_number_of_backers()`
update tests
initialize the `npatrons` column
rewrite `iter_payday_events()` and increase its test coverage
Merge pull request #2573 from gittip/more-history-tests

Simplify iter_payday_events and increase its test coverage
Merge pull request #2554 from gittip/cache-npatrons

Cache the number of patrons in the participants table
merge branch.sql into schema.sql
Bump version to 14.0.8
Bump version to 14.0.8-dev
Tweak homepage pitch

Trying to make it more direct and comprehensive, a little less
bullshitty?
No no strings attached
Don't just read, learn!
Merge pull request #2604 from gittip/solid-funding

Tweak homepage pitch (ps first merge)
Bump version to 14.0.9
Bump version to 14.0.9-dev
Merge branch 'master' into i18n

Conflicts:
	www/index.html.spt