Issue #49 Fix up block fetching more events

Use get_events_from_day in get_event_after_date to get enough events
for a day by upvotes and only move onto the next day after 3 events
are fetched.

Change the start of a block's day to be date + however many minutes are
in the user's offset.
Issue #49 Check event count on block create

When creating a block, check how many events it should be able to
load.
Issue #66 Adjust padding, height upvote container

Add some padding on the top of the upvote container to align it.
Specify the height of the upvote container so that it fits squarely in
a collapsed event.