Add url parameters to Atlas

[keatonwalker]

Add support for url parameters similar to the pointcompare review map.

If I could specify coordinates for one point and maybe a zoom level I could use Atlas in place of
google maps for a few different things geocoding related.

[stdavis]

This would be helpful for this issue. There's a 3.x version of it in the old widgets repo.

[stdavis]

Hey @keatonwalker. Just pinging you to make sure that you saw that this was implemented in the latest version of atlas that I just pushed to production.

[steveoh]

This doesn't place graphics on a map. Only center and zoom correct?

[stdavis]

Oh yes. I misread that. No graphic but it could be added easily.