Add 3 more Weather icons

[BachToTheFuture]

For issue #8:
Added new icons for 3 weather conditions:

• hurricane
• scattered snow showers
• snow showers

[scottmc]

Can you post png preview images of these three here in the comments for review?

[BachToTheFuture]

@scottmc So far they look like this:
Hurricane:

Scattered snow showers:

Snow showers:

[humdingerb]

Looking good.

The cloud shadows of the 'Scattered snow showers' isn't quite right. They should be a bit smaller and nearer to the clouds. The snow flakes should be fewer than for 'Snow showers' and should be distributed to use the whole height of the icon (i.e. from cloud to bottom of the icon).

I wonder if using a gradient for the 'Hurricane' that is green with only a small portion white (or very light green) could be used to make the waves look like they got some froth at the tips...

[BachToTheFuture]

@humdingerb Sure :)

[BachToTheFuture]

@humdingerb: Changed some icons :)

• changed shadow size and placement
• added a little gradient to the water

Hurricane

Scattered Snow Showers

This is a GCI task: https://codein.withgoogle.com/dashboard/task-instances/6224925888086016/

[humdingerb]

LGTM.