Forecast: added fahrenheit to celsius button
Forecast: cleaned up temp unit switching code
Forecast: made tetemp unit switch display which unit is selected
Forecast: made unit switcher IE8-friendly
Forecast: Add `spice from` to remove the `current` path.
Merge pull request #470 from duckduckgo/jag/forecast

Forecast: Add `spice from` to remove the `current` path.
Merge branch 'forecast-celsius' of https://github.com/mattr555/zeroclickinfo-spice into jag/forecast-celsius

Conflicts:
	share/spice/forecast/forecast.js