Refactor Subatlas functionality

[MikeGost]

Per discussion in PR #276, there are two ideas to try here:

1. Would it ever be possible to have subAtlas(Polygon) call subAtlas(matcher) underneath? It feels like the should really do the same thing, but subAtlas(Polygon) is a convenience method.

2. Does it make sense to have a subAtlas base class or interface? If 1 above can be done, there can be a default implementation for subAtlas(Polygon) and there could be a centralized source for logging and the packaging of the packed atlas.

[jklamer]

May I suggest a usage for https://github.com/osmlab/atlas/blob/dev/src/main/java/org/openstreetmap/atlas/utilities/filters/IntersectionPolicy.java? As the return value for different cut policies that can then be used by the the matcher when given a GeometricSurface(polygon).

[MikeGost]

#334 partially addresses this.