Fix: Home: Six events, not seven
Data: Parse Google spreadsheet for volunteer data

We keep the volunteer schedule in a Google spreadsheet.
Because of this, we can publish the doc and get the data
in json format, save it on our server, and add it to
our data api.
Guests: Add volunteer schedule filter

Show the schedule for a volunteer when provided
with a first name. Does not work with name conflicts
at the moment.
Guests: See volunteer shifts with name conflicts

When there is a first-name conflict, allow the
guest to narrow things down further.
Guests: Bump version, due to volunteers view