add actual forecast

[sojeri]

current UI only shows the weather right now.

add support for displaying the weather later today, tomorrow, etc.

as part of this, may need to

• investigate what currently used APIs support
• investigate other weather API options
• creep on hourly forecast options / displays in other apps
• trial different data sources to find one that works well for seattle
  • bias: just b/c it's good here doesn't mean it'll be good for other locs
  • risk: what if the one that's best for here doesn't support int'l locs? :(