Map basics

I feel like we should put some code in the repo so that we actually have something to work with. I want to check the maps for the 3 conditions and generate basic paths, but I believe we need to put at least a bit of basic code up before any of this can be accomplished.

Added the basics of a temporary grid class (because map team will probably make their own). Also created a few test maps that load roads,
nonroads, and stoplights. These still need to be implemented before
anything can be tested.