tweaks to nearby-change

[laidig]

notes to self before I forget: controller:

• do not show stops beyond a certain zoom (like the full-page map currently does)
• do not load new stops beyond a certain zoom
• update stateParams on map move so that returning back from the route takes back to the prior location.
• moving when showing route should not trigger reloading nearby stops?
• add 'show all' routes button to stops?

template:

• add message about not tracking arrivals to a stop with no tracked arrivals
• figure out why background on list item-divider (stop name) is not stretching fully across item

AtStopService:

• replace 'b/d' in SituationExchange with 'Both Directions:' ?

[laidig]

with the exception of "show all," these have been fixed