Get rid of source/models.

[vchynarov]

It's an messy submodule dependency that we don't really need for the current modex project.

None of the code is being used. Why not create a separate garlic-models repo that hosts the lightbulb model and the actual farm model?

That way we can do something like:

from waterloosig.models.import Farmsim
import Simulation

params = {}
farmsim = Simulation(Farmsim)
farmsim.params = {}
farmsim.run(host=127.0.0.1, port=8000) # sends to Twisted or whatever.