Distance Refactor

[joshreisner]

this PR fixes two bugs i noticed in the "near me/location" behavior.

1. it was hiding empty distance options, meaning that if you used distance and filtered to no results and then reloaded the page, you could get into a weird state (fixes Show empty distance options #230)
2. if you change to "near me/location" mode and picked a distance, then changed your mode back to search, you would see the word "within" dangling in the title, eg "Meetings in Los Gatos within"

additionally, it

• fixes the flicker you see when loading a page with location already set. it used to render results and then re-render after getting geo and setting distances, now it waits
• removes unused "no code api" endpoint parsing
• makes distance options user-configurable
• moves setMinutesNow functionality into filterMeetingData (locating all now-based calculations to that function)
• simplifies logic in filterMeetingData