Restrict to an area?

[mhulse]

From @beekman:

Might be cool to think of other ways to restrict the pool
To filter
Like v3 could maybe let you choose a continent
Or a band of coordinates
So equator only
Etc

Awesome idea.

Related: mhulse/rand-land-coords#5

So, should there be an option for someone to specify their own rand-land-coord image? Or, perhaps, just set an area and pass that along to rand-land-coords? So, should rand-land-coords restrict to an area?

See: mhulse/rand-land-coords#6