add zoom to all button
only pan to user's location if they're near
give lines a little color and area
fix station capacity was sometimes off
better plot extents
fix locate button did not update if you moved
fix non-integer bike numbers
refactor map code into a function
refactor to get more stuff into station json
add last updated indicator

closes #2
show next update indicator
add json resource for the market
add ability to update map async
auto-update map when data is stale
add better control over marker size
add autoupdate

closes #3