Create Smaller Attack Graphs Using exampleLang

[andrewbwm]

Create some smaller attack graphs using simple exampleLang models. The idea behind this is that a smaller language such as exampleLang would be better suited for creating smaller attack graphs to use for debugging the agents.

If exampleLang is not a viable option we may wish to create a new language called trainingLang for this purpose.

[andrewbwm]

We will implement a trainingLang instead as per #31